Alexis Sanchez went off injured for Manchester United in Saturday’s Premier League game with Southampton at Old Trafford.
The visitors were leading 1-0 when Chile forward Sanchez took a knock to his knee following a challenge with Jan Bednarek.
The forward tried to play on but quickly signalled to the bench that he was unable to continue and was replaced by Diogo Dalot in the 52nd minute.
Any injury would be a big blow to caretaker boss Ole Gunnar Solskjaer ahead of a potentially crucial two weeks in United’s season.
They visit Paris Saint-Germain for the second leg of their Champions League last-16 tie on Wednesday, trailing 2-0 from the first game.
United then travel to Arsenal in the Premier League next Sunday, before facing Wolves at Molineux in the FA Cup quarter-final on March 16.
Marcus Rashford returned from an ankle injury against Southampton, but Anthony Martial, Jesse Lingard, Ander Herrera and Nemanja Matic are all sidelined.
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