GAME OVER That's it then. A case of good things come to those who wait for the Gunners, who finally found a way past Nikopolidis with a couple of late strikes from Robin van Persie and Andrei Arshavin. It was beginning to look like one of those massively frustrating nights for Wenger's boys as the Olympiakos stopper made one fine save after the other, before RvP bagged the deserved breakthrough. Next stop on the CL express? Dutch champions AZ Alkmaar. Arsenal 2-0 Olympiakos.
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GROUP E UPDATE Arsenal going top with two wins from two, while over in Alkmaar, Standard Liege have come from behind to secure a share of the spoils.
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YELLOW CARD Raul Bravo collects a late booking.
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YELLOW CARD Fabregas sees yellow after catching the heels of Dudu.
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ALMOST THREE Arshavin's at it again, but this time he's onside and fires narrowly wide after racing onto Vela's slide-rule pass.
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GOAAAAL!!!! Goodnight Olympiakos. Andrei Arshavin plays a give and go with Fabregas and the Russian pokes it over the line from close range despite a strong shout for offside.
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SUBSTITUTION Wenger rings his final change as Aaron Ramsey replaces Robin van Persie.
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SUBSTITUTION Final throw of the Zico dice as Leonardo makes way for Oscar Gonzalez.
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YELLOW CARD Frustration creeping in as Vassilis Torosidis talks his way in to the book.
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SUBSTITUTION Zico hooks Ledesma and on trots Mitroglou.
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GOAAAAL!!!! At last. Fabregas slips in Eduardo, who races to the byline and slides a ball across the box and straight onto the boot of Robin van Persie. He couldn't miss.
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SUBSTITUTION Attacking change as Carlos Vela replaces Diaby.
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FLYING SAVE Nikopolidis tips van Persie's drive round the post and from the resulting corner Arshavin's effort is deflected behind.
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POINT-BLANK SAVE Who is this man? Nikopolidis with a world class save to keep out van Persie before recovering in the nick of time to deny Gallas on the follow-up.
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ONE OF THOSE NIGHTS? Arsenal still on top, but that final ball's proving elusive. Olympiakos still happy to sit back and soak up the pressure.
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SUBSTITUTION Arsene Wenger rings his first change, with Eduardo on in place of the tiring Tomas Rosicky.
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IN THE DUDU Olympiakos man Dudu picks up a booking after catching Diaby. The Arsenal man kicks out ala Beckham, but escapes unpunished.
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TOUCHLINE ACTION Not happening for the Gunners and it looks like we could see Eduardo before too long. Carling Cup hero Carlos Vela's also dusting off the cobwebs…
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TAME EFFORT The 'Vermaelenator' rises above his marker to meet RvP's inviting free kick, but the Belgian heads straight into the ground and wide.
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CABIN FEVER William Gallas is caught up field in unfamiliar territory after playing a quick give and go with Arshavin, before Raul Bravo dispossesses the marauding Frenchman.
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BALANCED The introduction of Ieroklis Stoltidis appears to have steadied the Olympiakos ship. Arsenal are going to have to up the ante if they're to notch the goal that their first half efforts deserved.
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HANDBAGS Michal Zewlakow vents his frustration at that earlier challenge and joins RvP in Lannoy's black book.
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YELLOW CARD Van Persie races clear, but fires straight at Nikopolidis. The Dutchman catches Michal Zewlakow on the follow-up and earns the first booking of the night.
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MANNONE THE MAN Arsenal are caught napping from a rare Olympiakos corner and Vito Mannone makes a stunning, point-blank save to keep out Olof Mellberg's towering header.
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GROUP H UPDATE AZ have opened the Group H scoring - they lead Standard Liege 1-0.
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SUBSTITUTION Just the one change at the break, with Ieroklis Stoltidis on for Jaouad Zairi.
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SECOND HALF Up and running again at the Emirates.
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HALF TIME Goalless at the break. The Gunners have bossed it, and but for the super-quick reflexes of a certain Greek shot stopper could easily be five or six goals to the good. Olympiakos have clearly come to defend and it's surely only a matter of time before Wenger's boys break the stiff Greek resistance.
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AND AGAIN He may struggle to deal with set pieces, but there's no questioning the shot-stopping ability of Nikopolidis, who keeps out a fierce effort from Rosicky.
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FINGERTIP SAVE Not the most convincing bit of keeping from Nikopolidis, who just gets enough on a Fabregas free kick. The resulting corner comes in and Diaby heads wide with the goal at his mercy.
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SILKY SKILLS RvP ties Raul Bravo in knots with a couple of swish, Cruyff-inspired turns. But the angle's too tight to trouble the keeper.
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VENOMOUS VAN PERSIE Fabregas finds the feet of van Persie, who steadies himself and smashes a venomous effort narrowly over the crossbar.
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WARNING SHOT Arsenal almost caught out as Vassilis Torosidis outfoxes Gael Clichy. His header, though, is straight down the throat of Mannone.
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A WHISKER AWAY Rosicky rolls his man, lets rip and wins a corner. In it comes and Vermaelen's inches away from prodding the ball beyond Nikopolidis.
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GROUP H UPDATE Still goalless over in Alkmaar between AZ and Standard Liege. We'll keep you up to date with any changes.
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THE NIKOPOLIDIS SHOW Arsenal fans are probably beginning to appreciate how Fulham must have felt last weekend as Nikopolidis sticks out a hand to deny another Fabregas drive.
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HEADS UP Rosicky and Raul Bravo collide. Looked innocuous, but the former Real Madrid man thinks the Arsenal midfielder led with an elbow. Nothing given.
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PASS AND MOVE IT'S THE ARSENAL GROOVE Arshavin combines with Clichy down the Arsenal left. Fabregas ghosts into the box, collects Clichy's teasing cross and wins a corner which comes to nothing.
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COVERED Still got it, Olof Mellberg. The big Swede brushes off the forward run of RvP and clears the danger.
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HITS THE WALL Ledesma comes over all kung-fu on RvP, but escapes with just a talking to. Fabregas lines up the resulting kick and fires straight at the Olympiakos wall.
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TURNING THE SCREW Arshavin shifts through the gears, leaving his marker for dead only to be denied by the sharp reflexes of Nikopolidis. Can't be too long before Arsenal find the net...
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OFF THE BAR Terrific strike from Cesc Fabregas, who rattles the woodwork with the keeper beaten. RvP meets the rebound, but his shot is blocked.
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TOP SAVE So close. Fabregas releases Clichy, who races clear before playing in Arshavin. Nikopolidis makes himself big, though, and denies the Russian a certain goal.
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CAUGHT FLAPPING Sketchy moment for Olympiakos keeper Antonis Nikopolidis as Arshavin pings a ball across the six-yard box. Rosicky's ready and waiting, but Raul Bravo saves his keeper's blushes.
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NOT SO HAPPY HUNTING GROUND Olympiakos boast an atrocious record on English soil, having lost their last eight, conceding 27 goals and scoring just once.
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RUSTY Arshavin's away and has the beating of Mellberg, but his touch lets him down and the ball spins out of play.
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CURLED WIDE Clever play from Andrei Arshavin, who races in from the left before curling one wide of the post.
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TOP SPOT TUSSLE Battle for top spot in Group H. Olympiakos, like Arsenal, also opened their Champions League campaign with a victory, defeating AZ Alkmaar 1-0.
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AWAY WE GO The ball's rolling at a buzzing Emirates Stadium.
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OLYMPIAKOS TEAM NEWS Raul Bravo starts - you might remember the Spaniard's horror, loan spell at Leeds United circa 2002-03. Oh, and Olof Mellberg also starts. The former Villa star netted the first competitive goal at the Emirates on the opening day of the 2006-07 campaign. Team in full: Nikopolidis, Zewlakow, Avraam Papadopoulos, Mellberg, Raul Bravo, Ledesma, Torosidis, Dudu, Zairi, Leonardo, Diogo. Subs: Urko, Domi, Galitsios, Stoltidis, Oscar, Mitroglou, Giannis Papadopoulos.
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ARSENAL TEAM NEWS Two changes to the side that edged out Fulham, with Emmanuel Eboue and Tomas Rosicky coming in for Bacary Sagna and Nicklas Bendtner. Team in full: Mannone, Eboue, Gallas, Vermaelen, Clichy, Song Billong, Rosicky, Fabregas, Diaby, Arshavin, van Persie. Subs: Szczesny, Sagna, Senderos, Eduardo, Vela, Ramsey, Gibbs.
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STAY TUNED Join us around 1920BST for confirmed team news and all things Arsenal-Olympiakos.
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REF WATCH French referee Stephane Lannoy takes charge of this one. It's only his fourth Champions League group stage clash, with his first coming back in December 2007 - Barcelona's 3-1 win over Stuttgart - in which he dished out three yellow cards. More recently, Lannoy cast an eye over VfL Wolfsburg's 3-1 win at home to CSKA Moscow and didn't think twice about awarding the German champions a spot-kick after Grafite had his shirt pulled in the area by CSKA defender Deividas Semberas.
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MATT DERBYSHIRE-IDISODOPOULOS CROCKED Playmaker Luciano Galletti and ex-Blackburn Rovers striker Matt Derbyshire miss out. But keep an eye on Greek international Vassilis Torosidis. His strength, versatility and technical ability have caught the eye of a number of Europe's big boys and if the rumours are to be believed, it won't be too long before Olympiakos' star man is plying his trade elsewhere.
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THE LOWDOWN: OLYMPIAKOS Olympiakos bagged the domestic double last term for the second time on the bounce. In fact, they're pretty dominant on the domestic scene, having been crowned league champions every season since 1996-97 barring the 2003-04 campaign (the last time Arsenal won the Premier League). They're unbeaten this term, with four wins and a draw from five league games, and in Europe they've yet to concede a single goal in five outings. Nevertheless, that one draw coupled with a 5-0 friendly defeat against Ergotelis marked the end of the now jobless Temuri Ketsbaia and his three-month tenure at the club. Up step Brazilian legend Zico, whose attack-minded changes have folk in Piraeus dreaming of a place in the last sixteen of European football's most prestige competition.
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CRASH TEST DUMMY Nicklas Bendtner will be unavailable after writing off his Aston Martin at the weekend, while Denilson, whose back problem has been diagnosed as a fracture, could be out until the end of the year. On the plus side, Theo Walcott is expected to feature after a three-month spell on the sidelines with a back complaint. Goalkeeping revelation Vito Mannone should continue between the sticks in place of Manuel Almunia (virus).
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PREVIEW Arsenal will be looking to stamp their authority on Group H as they entertain Greek champions Olympiakos at the Emirates. Greek sides are notoriously bad travellers on the European circuit, and for many tonight's clash is a home banker. The Gunners hit back after successive defeats in Manchester with a remarkable come from behind win in Liege, before thumping Wigan. And last weekend, Wenger's young guns showed us they're more than just a bunch of flair boys and they do in fact have the dogged temperament to win ugly and maybe, just maybe, at long last turn their electrifying talent into silverware.