Liverpool playmaker Philippe Coutinho will have a scan on his injured ankle on Monday afternoon.
Press Association Sport understands the early indication is the Brazil international has most likely sustained ligament damage against Sunderland, although there will be can be no assessment of the extent of the damage until the results of the scan are known.
Coutinho attended the club's Melwood training ground on Sunday and later left, as he did Anfield last night, on crutches with his right foot in a protective boot.
There is more positive news on compatriot Roberto Firmino, who was forced off after receiving a kick to his calf late on in Saturday's 2-0 win over the Black Cats.
The Reds' medical staff do not believe he requires a scan but is likely to be rested for Tuesday's EFL Cup quarter-final at home to Leeds.
Striker Daniel Sturridge missed the Sunderland game with a tight calf and did not train on Sunday, making his participation on Tuesday also doubtful.
Midfielder Adam Lallana, who has been sidelined since sustaining a groin injury on England duty earlier this month, is making good progress as he continues to train outside with the fitness coach.
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Fernandinho knows Manchester City must come through tests like the one they did today if they are to win the Premier League.
City came from 1-0 down to beat Burnley at Turf Moor, Sergio Aguero's 32nd and 33rd goals in his last 34 Premier League games securing a 2-1 win.
"We expected a game like that," the midfielder told BT Sport.
"We analysed Burnley before, they play long balls, play for second balls and they started like that.
"But we scored two goals and turned it around and won the game.
"We want to be champions, we have to play these kind of games."
Ander Herrera has stressed the importance of Manchester United making their attacking work count by showing more ruthlessness in front of goal.
United head into Sunday's clash with West Ham at Old Trafford having won only one of their previous six Premier League fixtures, a 3-1 triumph at Swansea.
In the other matches, they have been held at home 1-1 by Stoke, 0-0 by Burnley and 1-1 by Arsenal, drawn 0-0 at Liverpool and been thrashed 4-0 at Chelsea.
After the Red Devils on Thursday saw off Feyenoord 4-0 in the Europa League, United boss Jose Mourinho emphasised the need for his side - who he had recently described as "the unlucky team in the Premier League" - to convert their chances in domestic action.
Midfielder Herrera feels United are doing a good job in terms of fashioning scoring opportunities, but also has no doubt they need to be more clinical with them.
Herrera told United Review: "In football I think the most difficult thing is to create chances. To be in the third part of the pitch and getting good shots away and we are doing that.
"So the most difficult thing is what we are doing, but now we have to score the chances, that's what football is about. So of course we have to finish better."
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Wayne Rooney is not expected to face any disciplinary action from the Football Association over his late night during last international break.
Rooney was pictured at The Grove, where the team were based between games against Scotland and Spain, mingling with fellow guests in the early hours following a day off.
Newspaper reports suggest the England captain was drunk and made an unscheduled appearance at a wedding reception, with chief executive Martin Glenn promising an investigation into the conduct of all players and staff during their free time.
Press Association Sport understands that the player's representatives have been in contact with the FA and are assured no disciplinary action will be taken against him.
It is further understood that any suggestions of Gareth Southgate, then interim manager and soon-to-be permanent boss, asking the player to go to bed and being ignored are inaccurate.
Rooney denies entering the wedding reception but was happy to pose for pictures with guests in communal areas of the hotel. While new guidelines around down time are sure to follow when England next link-up in March, FA management are not actively reviewing the behaviour of any players at present.
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A former chief executive of the FA has claimed there could be many more footballers who have been victims of child sexual abuse.
On Thursday, former Manchester City star David White became the fourth ex-footballer to speak publicly about the abuse he received from a former football coach.
Speaking to ITV News, Mark Palios said: "If you stand back and look at the sport, it is a sport that has so many youngsters playing in it, it's one of those areas - one of those fertile grounds - that paedophiles would attack.
"One would expect at some stage this would have happened.
"As to whether it's the tip of the iceberg, I think almost certainly if you play a numbers game there are a lot of individuals who have unfortunately been dealt with in this way."
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