Alexis Sanchez of Manchester United celebrates. (Photo by John Peters/Man Utd via Getty Images)

Manchester United forward Alexis Sanchez has suffered a hamstring injury and he is a  doubt for Saturday’s trip to Southampton.

The 29-year-old sustained the injury in training on Thursday and will now be assessed ahead of the trip to St Mary’s stadium.

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A club statement read: “Alexis sustained a hamstring injury in training on Thursday which requires further investigation to confirm severity.”

Sanchez has struggled for first-team opportunities this season and was left out of the squad that beat Young Boys in the Champions League on Tuesday.

However, United manager Jose Mourinho expects the Chilean to remain at Old Trafford beyond the January window.