Mourinho has left the 20-year-old out of his side's squad for the club's official club tour, meaning Wilson could be on his way out of Old Trafford.
Wilson burst on to the scene at Manchester United, scoring two goals on his debut in May 2014 in a 3-1 victory over Hull City.
However, the striker since struggled to get game time for United and has only added one more goal to his tally for the Red Devils.
Wilson spent the second half of last season on loan at Brighton and Hove Albion, where he scored five goals in 27 games for the south coast side.