Arsenal have confirmed Gabriel Jesus suffered an ACL injury in the FA Cup defeat to Manchester United on Sunday and is set to undergo surgery in the coming days.

An Arsenal statement read: "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.

"Gabby will undergo surgery in the coming days and will soon begin his recovery and rehabilitation programme.

"We will continue to keep everyone updated with Gabby's recovery, with everyone at the club fully focused on supporting Gabby to ensure he is back to full fitness as soon as possible."

The injury means Jesus is set for a lengthy spell on the sidelines, with the typical recovery time for an ACL rupture around nine months, and leaves Arsenal with only one recognised striker in Kai Havertz.

Arsenal is working hard behind the scenes to recruit a striker in the January transfer window. They were exploring both long-term targets and short-term options even before Jesus' injury.

The Brazil international had scored six goals across his last seven appearances for Arsenal, who sold striker Eddie Nketiah to Crystal Palace in the summer.

"We are actively looking in the market to improve the squad," said Arteta earlier this week. "We would be naive not to do that. There is an opportunity to improve the squad.

"We are looking and trying. Let's see what we are able to do. When you recruit a player there are three parties. We also have our limitations, we can do what we can do."

When pushed for an answer on whether or not a forward was the priority, he added: "In any position.

"We have other issues as well. A player can bring things to a team in different ways. That is what we are trying to do."

Jesus, 27, has seen his Arsenal career blighted by injury since arriving from Manchester City in 2022 and is now set for an extended spell out, with fellow forwards Bukayo Saka and Ethan Nwaneri also sidelined currently.

Jesus started the cup tie against United but was forced off after just 41 minutes.

Arsenal continue their Premier League campaign at home to Tottenham on Wednesday.