Arsenal manager Mikel Arteta says the club are “very concerned” about forward Gabriel Jesus after he suffered a knee injury against Manchester United – and says he is looking to strengthen the squad this month.

Jesus, 27, injured his knee in the first half of the FA Cup defeat at the weekend and while Arteta could not confirm the severity of the damage he does not expect a quick return for the Brazil international.

Arsenal face north London rivals Tottenham on Wednesday night.

“(It) doesn’t look good at all, but we need to review with a specialist and will have more information this afternoon,” Arteta said.

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“I don’t want to confirm anything until we have the final report this afternoon. We were very worried after the game and we are very worried today.

“We are actively looking at the market to improve the team. We always have been. He wouldn’t be naive either. We are looking and we are trying, so let’s see what we can do.

Arsenal struggled to finish off late chances with Kai Havertz guilty of a particularly bad miss against United which led to abuse on social media.

Arteta says something must be done to protect the players and calls for calm from supporters.

He said: “It’s unbelievable, honestly. We really have to do something about it because accepting it has terrible consequences. It’s something we have to eradicate in the game. It’s about action.

“On December 27, we won 1-0. Havertz scores a goal and the whole stadium sings his song. That was only 20 days ago, so where’s the perspective? We are all responsible for the narrative and we cannot look elsewhere. It is really a serious matter.

“A line has to be drawn. It can’t happen. This is what we should aim for. “

‘Best game of the season’

Arsenal have won six of their last eight Premier League meetings with rivals Spurs – who have won once in 31 meetings with the Gunners in the Premier League.

It’s good for Arsenal and Arteta says he’s looking forward to the game.

“It’s the best game of the season to watch and play in because of the atmosphere and what it means to people — us and everyone involved,” he said.

“The environment is something the fans can help with and something we can do by giving them something to feed on.

“Let’s do it.”