Arsenal striker Gabriel Jesus will be out for a long time after suffering a suspected ACL tear in the defeat to Manchester United.
The Brazilian had to be stretchered off after a collision with Bruno Fernandes towards the end of the first half of the Gunners' third round elimination.
There are now fears that he will miss the rest of the season due to another injury suffered by Mikel Arteta, who is no longer counting on talisman Bukayo Saka.