Alex Oxlade-Chamberlain will miss up to four weeks with a hamstring injury.

Oxlade-Chamberlain sustained the injury in the second half of Arsenal's win on Monday at Manchester United.

The England international has made 35 appearances for the Gunners in all competitions this season, scoring three goals.

"It is a classic hamstring and that means he will be out for three to four weeks maximum," Wenger said.

"In the last few months he has been a bit in and out, but he showed again on Monday what an important player he can be for Arsenal and England and it is a shame that in the final sprint he is not there.

"How much will it affect him [mentally] I don't know. He loves to play and he is keen to play for England as well and it is a big blow for him, but he knows that this kind of injury he can recover quickly and he can come back, but it is not an ideal moment."