Arsenal duo Robin van Persie and Mikael Silvestre could feature in the Champions League semi-final second leg clash against Manchester United after being able to train on Monday.
Van Persie has been struggling with a groin injury and hasn't played since last month's FA Cup semi-final defeat to Chelsea.
Silvestre picked up a similar injury in last week's 1-0 first-leg defeat against his former club but may be fit enough to play in the Emirates Stadium return.
Gunners boss Arsene Wenger is keeping his cards close to his chest as to the formation of his team for Tuesday's crucial encounter.
He played a 4-2-3-1 formation at Old Trafford last week but, if van Persie is fit enough to start, he may revert to 4-4-2.
"Why not?" said Wenger. "But it will depend also on who is available.
"We started in a 4-4-2 against Portsmouth on Saturday and I think it looked more threatening and we looked more comfortable.
"But when you play Walcott on the right you play more 4-3-1-2 anyway. He is a winger not a midfielder so you have to balance the side to be a bit more defensive.
"Also, if Fabregas plays behind the striker, the striker looks to be a little isolated so you have to get the balance of the team right.
"No matter who starts, what is important is that everybody is focused so they can come on and help the team to qualify.
"That's what we have to produce on Tuesday night - the game worthy of a semi-final. We have to make it hard for them."