Jack Wilshere has undergone ankle surgery and will miss three months.

Wilshere suffered the injury in Arsenal's lost last weekend at home against Manchester United.

Arsenal currently has 10 players sidelined by injury.

Wilshere wrote: “Ankle needed surgery in the end, went well thanks to the main man James Calder! Work hard for what you want because it won’t come to you without a fight.

“You have to be strong and courageous and know that you can do anything you put your mind to. If somebody puts you down or criticizes you, just keep on believing in yourself and turn it into something positive.”

Mikel Arteta could "be out for a while" with the calf injury that made him exit Arsenal's 2-0 win over Borussia Dortmund on Wednesday.

"That doesn’t look good, it’s the calf," Arsene Wenger told Sky Sports. "It’s very difficult to take on the chin because we are going into many games and you need everybody available, but I think Arteta will be out for a while."

"I liked what he did tonight because we decided to go long to him and he protected very well the ball, what he did on the first goal was class, his link-up play with Cazorla, but unfortunately he got injured."

Jack Wilshere could face ankle ligament surgery and a lay-off of around three months.

Wilshere will meet with a specialist on whether he needs the operation to repair the damage to his left ankle that he suffered after a challenge from Manchester United’s Paddy McNair on Saturday.

If Arsenal feel that Wilshere can be fully rehabilitated without the surgery, he would be back in action sooner but he would still most likely miss around eight weeks.

Thomas Vermaelen may need surgery to repair a hamstring injury.

Vermaelen has yet to make his Barcelona debut after coming over from Arsenal in a £15 million transfer.

“We don’t know if Vermaelen is now going to need surgery, we are studying the situation,” Barça’s sporting director, Andoni Zubizarreta, said, before Tuesday’s Champions League match at Apoel Nicosia. “We are worried for him and the medical staff are evaluating what is best.”

The 29-year-old sustained the injury playing against Russia at the World Cup in June.

Marco Reus injured his ankle again in the second half of Borussia Dortmund's 2-2 draw against Paderborn.

“It is very difficult to process the fact that Marco Reus could again be ruled out, more difficult than dealing with the draw,” said Jürgen Klopp.

Reus missed the World Cup with an ankle injury and was hurt again in early November.

Reus had to be taken off on a stretcher and won't return until January.

Radamel Falcao is at least two weeks away from being healthy enough to return after suffering a "new injury."

Falcao has missed Manchester United's last three Premier League matches with a calf problem and has not yet played a full 90 minutes for the club.

"It takes time," Louis van Gaal said. "Next week he [Falcao] shall train, probably with our selection and then he needs two weeks and maybe a game."

Daniel Sturridge will miss six weeks with a second thigh strain of his injury-plagued season.

Sturridge was sent for a scan on Wednesday having pulled up in training for what was scheduled to be his return from a 10-week lay-off against Crystal Palace on Sunday. 

Sturridge missed six weeks with that initial problem and, though Liverpool have not put a timeframe on his latest absence, he is expected to be out for a further six weeks and is therefore unlikely to play again in 2014.

Philipp Lahm will be out of action for three months after suffering a fractured ankle in training on Tuesday with Bayern Munich.

The club tweeted: "Big blow for Philipp Lahm: The captain has suffered a fractured ankle. He needs an operation and will be out for around three months!"

The player had to be stretchered off on a golf cart following the training accident, which the club said did not involve another player.

Luka Modric will be out for three months with a torn tendon in his thigh.

Modric picked up the injury in a Euro 2016 qualifier against Italy on Sunday.

"The Croatian national team and Real Madrid midfielder will be away from the football pitch for about three months after the injury sustained in the encounter between Italy and Croatia," said a statement on the HNS website.

Modric has been a critical part of Real Madrid's midfield again this season.

Luka Modric will be out for three to five weeks due to an adductor injury.

"Modric felt pain in his adductor and will undergo tests in Madrid to determine the extent of the knock. We will know more on Monday or Tuesday," Croatia coach Niko Kovac told HTV.

Modric has been a key figure for Madrid in the opening months of the 2014-15 campaign, making 17 appearances in all competitions.

The absence of Modric could see Sami Khedira return to the Madrid starting XI in the next few weeks.