Assured in coming off his line and claiming catches and had no chance to stop Rosicky's clinical finish.
Supported Abdoun to good effect when he attacked down the left but left some big gaps at fullback which Arsenal often attacked into and might have exploited more.
Sometimes clumsy in dangerous positions, gifting a golden chance to Ramsey that the Welshman squandered early on. But usually kept his winger at bay thereafter and made the occasional foray forward.
Looked like he might struggle to deal with the pace Arsenal offered but generally did well to keep the attackers in front of him and anticipate and block penetrative passes.
Didn't grab the game by the scruff of the neck in the position behind the striker, but some of his touches were delightful and helped Abdoun move into dangerous positions.
Easily Olympiakos' biggest threat. His dribbling was too much for many of the Arsenal players to deal with and his passing was penetrative too. Forced Szczesny into a couple of testing saves.
Tried to be aggressive and break up play to mixed effect in midfield, occasionally leaving the Olympiakos defense unprotected and vulnerable to counterattacks, but bundled home their equalizer from close range.
Drifted in and out of the game as most of Olympiakos' attacking play came down the left. But he did come close with a header and delivered one superb cross which Djebbour should have converted.
Made the occasional break forward but the only time he really got into a decent position, he stabbed an awful shot into the side netting. Replaced by Fuster in the second half.
Had little joy in forcing Vermaelen into a mistake and squandered the one good chance he did get when he headed wide from close range.
Repelled everything that came his way, although most of his saves were routine ones. Usually kept a firm grip on the ball but parried to safety when he needed to. Saw out one difficult period when Olympiakos equalized with a couple of good saves that had him stretching. His visibility seemed to be impaired when Mitroglou shot across him because he was late reacting.
Targeted by Olympiakos and he looked shaky. Struggled to deal with Abdoun's pace and was forced into some cynical fouls to stop Olympiakos attacks. Failed to mark Paulo Machado, who drew a save from Szczesny with his header before the hosts went on to score from the subsequent corner.
Did not have a whole lot of support and struggled to deal with the interplay between Torossidis, Greco and Abdoun. Was lucky to see Djebbour miss the target after he got behind him to meet a cross.
Strong at the back, dealing with the threat of Djebbour, who looked to play on his tail and sniff out chances in the box. Won plenty of headers and made an important interception to cut out a cross Djebbour would have converted in the first half.
Confident at left back, showing that he was not afraid to play his way out of trouble and hold on to possession. Made some strong tackles and did not give Paulo Machado too much space to play in.
Scrapped out a good chance early on but was disappointing thereafter. His control often let him down at vital times and he was susceptible to running the ball into difficult areas.
Showed some nice touches and movement in midfield but seemed to freeze as soon as he got near the opposition penalty area. Fluffed one superb chance early in the first half.
Had a strong first half before being replaced by Arshavin at the break. The most composed Arsenal midfielder in possession and calmly swept home Gervinho's pass to give the Gunners the lead from just inside the penalty area.
Did not really provide adequate protection for Jenkinson or Squillaci. Might have anticipated that Vermaelen and Meade were holding up better on the left side than their partners across from them and given them more defensive help.
Had been largely frustrating in his decision-making and final ball until he did well to turn back and pick out Rosicky for the opening goal. Continued to get himself into good positions but struggled to consistently turn his running into good chances.
Provided a target for Arsenal and tried to do the right things, laying the ball off for midfielders and winning headers, but his touches were too frequently very clumsy.
Looked bright in the hole, bringing Paulo Machado into the game more by drifting to more of a right-sided position after Greco had normally played on the left.
Another goal threat for Arsenal to think about and almost immediately made the difference after replacing Abdoun. Guided a low, curling shot beyond Szczesny from 20 yards.