Arsenal striker Gabriel Jesus is set for a long layoff after suffering a suspected ACL rupture in the defeat by Manchester United.
The Brazilian was forced off on a stretcher following a collision with Bruno Fernandes towards the end of the first half of the Gunners' third round exit.
There are now fears that he will miss the remainder of the season in another injury blow to Mikel Arteta, who is already without talisman Bukayo Saka.
