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

“Further to being substituted during our match with Manchester United on Sunday, Gabriel Jesus has received extensive assessments, scans and specialist reviews which have confirmed that he has sustained an injury to the anterior cruciate ligament in his left knee,” Arsenal said in a statement on Tuesday night.

Mikel Arteta has confirmed Arsenal are looking to sign a new striker in the remaining two weeks of the January transfer window. The Gunners are light on numbers in attack after a number of serious injuries.