Arsenal manager Arsene Wenger confirms midfielder Francis Coquelin suffered a broken nose against Everton.
The Frenchman was hit by team-mate Olivier Giroud but opted to stay on the pitch before being replaced by Calum Chambers in the 89th minute of the game.
And the 23-year-old will be assessed by the Arsenal medical team to understand whether he will require surgery to fix the problem.
"Yes [Francis Coquelin has broken his nose]," Wenger confirmed.
"I don't know [how long he will be out], I hope not. I don't know whether he will need surgery or not.
"They told me he was bleeding but that he could stay on. The second time he was hit again so after that I had to take him off. I had been told by the medical people that he could stay on.
"He wanted to stay on. He didn't play here for a long time so now that he plays, of course he doesn't want to come off the pitch."
The Gunners continue their quest for a top four finish and the Frenchman believes his side are in a strong position to qualify for next season's Champions League.
"It depends what you call on the rise," he said.
"We have three more points than last week and if you look at our Premier League run since November, I think we are in a good position."
