Arsenal manager Arsene Wenger will give Cesc Fabregas until the last minute to prove his fitness for Wednesday's Champions League quarter-final first leg against Barcelona as the Gunners captain struggles to recover from a knee injury. Fabregas suffered bruising to his right knee and leg after a tackle from Craig Gardner during Saturday's 1-1 draw at Birmingham and was unable to train with the rest of the squad at their London Colney base on Tuesday. The 22-year-old still hopes to play through the pain barrier in the first leg clash with his former club at the Emirates Stadium and Wenger will give the Spain midfielder until the pre-match warm-up to prove his fitness. 'He didn't appear in training because at the moment he is not fit to play. We will give ourselves 24 hours more to assess the situation,' Wenger said on Tuesday. 'It is too early to say. Sometimes 24 hours more can help. You don't want him to get another kick so it was better that he didn't train. 'The medical staff tell me he still has a chance to play. We will decide on how he is in the warm-up on Wednesday. 'That tells you how late we will leave it. At the moment it is 60 percent against him playing.' But the Arsenal manager admitted he would only select Fabregas if he is fully fit. 'Would the game be today, he would not play. If he is full capacity we will play him. If he is not fit to play I wouldn't even put him on the bench,' Wenger added. While Fabregas's participation is uncertain, Wenger hinted that France defender William Gallas may return to the team ahead of schedule. Gallas has been sidelined since February with a calf injury but he is in the squad for Wednesday's match and Wenger said: 'Gallas is in the squad. He had good training sessions. I have not picked the team yet but he has a chance.' 