Arsenal's Brazilian forward Gabriel Jesus is set for a lengthy spell on the sidelines after suffering what is suspected to be an anterior cruciate ligament (ACL) injury, according to British media reports on Tuesday.

Arsenal announced Gabriel Jesus suffered an ACL injury in his left knee against Manchester United in the FA Cup with the striker set to undergo surgery.

Gabriel Jesus' knee injury is “not looking good,” Arsenal manager Mikel Arteta said Tuesday. The Brazil striker was taken off after 40 minutes in Arsenal's FA Cup loss to Manchester United on Sunday.