Alexis Sanchez will miss three weeks with a hamstring injury.

Sanchez suffered the injury in Sunday's tie at Norwich.

Sanchez will miss the final Champions League match of the group stage on Dec. 9th.

Daniel Sturridge has had a run of injuries and Jurgen Klopp believes he will need to overcome the pain barrier.

Sturridge has made just 10 Premier League starts since the beginning of last season.

"I understand why everybody's waiting," Klopp said. "Daniel has very often been injured in the last few months and years.

"If it wasn't someone with the quality of Daniel, no one would think about it. You have to learn to adapt to the new intensity of training. You have to learn what is serious pain and what is only pain.

"Everybody wants him back on the pitch but we all have to learn. The training was intensive, as it should have been. We've had to make an assessment [of the injury]. It's not that serious but it's not possible to train as before. That's completely normal after a long injury.

"Last season he had surgery, and had a really long period out. He has only played three games since, but we have to stay patient. I am sorry for you, sorry for me and sorry for him. But that's the situation."

Francis Coquelin will miss at least two months with a knee injury.

Arsene Wenger suggested Mathieu Flamini or Calum Chambers could fill in for Coquelin as Arsenal's defensive midfielder.

“I’m always cautious. It will be at least two months but I don’t want to speculate more than that,” said Wenger when asked about Coquelin. “I must say we have been hit very hard in November. We have lost a few players.”

Arsenal could use the January transfer window to bring in a replacement.

“It is of course a disappointment to lose him in the longer term but we have in the squad the players who can compensate. We have lost a player of quality for a while but we know that can happen,” he added.

“I will give myself time, we have players who play in this position like Mathieu Flamini and players who can play there like Calum Chambers.

“Sometimes this is a good opportunity for other players to turn up and do the job. I will do what is needed in January, knowing as well it is not an ideal transfer market.”

Lionel Messi will be a match-time decision for Saturday's Clasico against Real Madrid.

After injuring a ligament in his knee in late September, Messi has not played but returned to training during the most recent international break.

Luis Enrique said he would base his final decision on how Messi was feeling just before the match begins.

"Whether Messi plays or not -- I prefer him to play, of course -- the great news is that he is fit again," Luis Enrique said on Friday. "When will I make the decision about Messi starting or not? I'll talk today with him, tomorrow, and it'll be decided an hour before the game.

"We know he's not going to be 100 percent fit, coming back from injury, depends how he feels, but it's great for us he's back.

"Only the player can only tell you how he is feeling."

Samir Nasri will be out for Manchester City until February with a hamstring injury.

Nasri has made eight appearances for City this season - scoring once in the 2-0 win at Everton in August - but has started only two games.

Nasri came from Arsenal to City in 2011.

Mario Balotelli is likely to be out for three months after it was reported in Italy that he is to have a hernia operation in the next few days.

Balotelli has not played for Milan since a defeat by Genoa on September 27th after being troubled by the groin problem and is not now likely to compete for a place in the side until mid-February.

Balotelli, who had originally moved to Liverpool from Milan for £16 million and is still having part of his salary paid for by Liverpool, had an unhappy season on Merseyside, scoring just four times in 28 appearances.

Thiago Alcantara has been ruled out for three to four weeks by Bayern Munich with a knee injury.

Thiago has suffered a succession of knee problems in recent seasons, said on Monday that he will be out "just for a few weeks," and Bayern confirmed the news on Tuesday.

"Following a thorough examination, the Bayern Munich team doctors detected capsule damage in [Thiago's] right knee," a club statement read.

"The injury is not connected to Thiago's prolonged problems in the past. All the same, the midfielder is set for a three- to four-week layoff."

Lionel Messi has returned to training with Barcelona for the first time in seven weeks.

Messi suffered a knee injury on Sept. 26th.

Messi may be added to Barcelona's list of subs for El Clasico on Saturday at Real Madrid.

Argentina's team doctor Homero de Agostino has said Messi runs the risk of a recurrence of the injury if he makes his comeback against Real.

Mario Balotelli has made just four appearances this season for AC Milan as he deals with a hernia that hasn't healed as expected.

Balotelli has been out since the start of October and may need surgery.

Liverpool is hoping Balotelli plays well enough so his value will rise and they can recoup some of his $21.5 million transfer fee.

Dimitri Payet may miss three months for West Ham with an ankle injury.

Payet moved from Marseille to West Ham for £10.7 million and had scored five goals in 14 appearances.

Payet suffered the injury in a challenge from James McCarthy.