Paul Pogba has been pictured leaving The Lowry Hotel without any medical aide but faces against time if he is to feature in Manchester United's game against Swansea on Sunday.
Pogba was forced to come off during United's disappointing 2-1 defeat away against Fenerbahce on Thursday night.
The Frenchman seemed to injure his thigh when he went in for a tackle with Brazilian midfielder Souza.
He tried to carry on but was replaced by striker Zlatan Ibrahimovic after 30 minutes.