Arsene Wenger admits Thierry Henry is a major doubt for Arsenal's UEFA Champions League return with PSV Eindhoven.
The Gunners captain is struggling with a foot injury which forced him to miss Wednesday's FA Cup defeat at Blackburn Rovers.
He is likely to sit out Saturday's Premiership game with Reading and is racing against time to be fit for the second leg with PSV next Wednesday.
Tomas Rosicky has already been ruled out of the Emirates Stadium clash, with Arsenal trailing 1-0 from the first leg in Holland.
And Arsenal boss Wenger concedes it is 'impossible' to say whether his skipper will be fit to line up against PSV.
"Tomas will be out for the PSV game and Thierry is a doubt," Wenger told the club's official website.
"We will try our best to get him fit, but at the moment it is impossible to say.
"The suspended players will be back for this game, so Adebayor and Toure will play. Maybe Abou Diaby will be back too."
For Saturday's test with Reading, though, Wenger is confident of having Johan Djourou and Cesc Fabregas back in his plans.
He added: "Saturday looks to me very short for all of the injured players.
"The only one who could return is Johan Djourou (ankle). Cesc Fabregas will come back after he was rested at Blackburn."