Jose Mourinho is thought to be an admirer of the Portuguese defensive midfielder and Caliomercato are claiming that the Premier League giants will make their move for Carvalho when the January transfer window opens.
The 24-year-old Sporting midfielder had a very good tournament in France this summer and helped his country win the Euro 2016.
Carvalho is a defensive midfielder who specialises in his reading of the game and breaking up of the play.
Manchester United lack a strong defensive midfielder in the middle of the part and if the report from Calciomercato is true, Carvalho could be an excellent addition for the Red Devils.