Arsenal's Tomas Rosicky is unsure if he will be fit to face Chelsea on Sunday, live on Sky Sports 1.
The Czech Republic international sat out last weekend's win over Fulham with a hamstring injury.
Rosicky is still struggling with the strain and is unsure if he can prove his fitness before Sunday's clash at Emirates Stadium.
"Personally, I hope I'll return soon," he told his personal website. "But if it is for Sunday's derby, I cannot say if I'll be fit.
"There are still a few days left in which I'll step up my training and then we will see if I am ready to return to action.
"For now I can only reveal that starting on Sunday is very uncertain. The good news is that I have started with running in the last few days.
"However, they have just been light trainings in which I've had no problems. Only a sharp session can show if I'm ready.
"Of course I'd like to play against Chelsea and not only because I would meet Petr Cech.
"Liverpool are one point ahead of us but we want to erase their lead with two games left."