Arsenal manager Arsene Wenger says midfielder Aaron Ramsey could face weeks on the sidelines after suffering yet another hamstring injury.
Ramsey came on in the 73rd minute against Leicester City but was forced out of the game after only nine minutes since coming on.
Back in the December, the Wales international was ruled out for four weeks after scoring twice against Galatasaray in the Champions League and Wenger fears the 24-year-old suffered a recurrence of his hamstring injury.
"It looks like it [the hamstring for Aaron Ramsey]," Wenger said during his press-conference.
"I don't know how bad it is yet. Just visually, it didn't look good. When a guy stops straight away and sits down, that's not good news.
"There's a recurrence now of a few muscular injuries and it's difficult - we haven't found out why. I basically left him out today because I wanted to be cautious with him.
"I had to bring him on - I had a hesitation between Flamini and him - because we lacked a a bit of offensive power. It was not the best of decisions.
"Last year was a thigh but this year it's a recurrence of hamstrings. You cannot say it's no worry because after the player doesn't play with the freedom in mind.
"He's not overplayed. Before I never looked at him, I just played him in every game but since he's had these problems I'm a bit more cautious with him."
Meanwhile, the Frenchman was cautious about how long Alexis Sanchez will be ruled out.
"[Alexis] Sanchez got a knock on his knee," he said.
"I don't think he was himself. From the moment he got this knock, he was never really comfortable. I don't know for how long he will be out and whether he will be out or not. I haven't seen the doctor."
