Mikel Arteta could "be out for a while" with the calf injury that made him exit Arsenal's 2-0 win over Borussia Dortmund on Wednesday.

"That doesn’t look good, it’s the calf," Arsene Wenger told Sky Sports. "It’s very difficult to take on the chin because we are going into many games and you need everybody available, but I think Arteta will be out for a while."

"I liked what he did tonight because we decided to go long to him and he protected very well the ball, what he did on the first goal was class, his link-up play with Cazorla, but unfortunately he got injured."