Bukayo Saka was taken off at half time on Monday night after a heavy challenge from Crystal Palace’s James McArthur.
So what’s the latest on his fitness - and what are his chances of taking part against Aston Villa on Friday?
"He hasn’t trained yet, so again we have to assess him today and see how he is," Mikel Arteta said in his pre-match press conference.
"It is down to the doctors and himself to see how he recovers and how he feels when he trains today and tomorrow.
"He is very important, he has shown how important he is for the team."
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