PHOTOS: Arsenal players train ahead of crunch Champions League showdown against Olympiacos

The Gunners must win by a clear two-goal margin or score four times to secure their progression through to the last 16

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Arsenal have been training ahead of their do-or-die Champions League clash at Olympiacos tomorrow.

Having lost the home tie against the Greek outfit 3-2, the Gunners need to win to draw level on points with their opponents in second place.

However, a one-goal margin will not be enough, unless they score three times, given Olympiacos' three strikes at the Emirates.

Arsene Wenger cast a watchful eye over his injury hit squad as they prepared for the match earlier today, looking to maintain their 12-year record of qualifying for the knockout stages.

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Stuart MacFarlane/Arsenal FC via Getty

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They will be without stars such as Alexis Sanchez and Santi Cazorla tomorrow evening, but German playmaker Mesut Ozil is available and is in line to start.

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Wenger admitted he would like to give him a rest, but knows he cannot afford to, and the World Cup winner has called for focus among his teammates.

Ozil said: “We have to be focused on the game, we have to give a really good performance.

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Dan Mullan/Getty

Dan Mullan/Getty

"If we score an early goal, I’m confident that we can win this game and go through. I hope that I can help the team with a good performance on the night.

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“We know that we have a lot of quality up front, but our goal is to go into half-time ahead and then we will know that everything is possible. We have to also be careful in defence that we don’t concede a goal.”

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