The Sun say Mourinho told the team to accept responsibility and to appreciate their position ahead of the international break.
Many of the side have joined up with their national teams ahead of the pre-World Cup friendlies over the weekend.
Mourinho’s position as United boss has come under slight pressure after they were dumped out of the Champions League to Sevilla.
Ian Wright: Jose Mourinho is bullying Luke Shaw at Man Utd
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Man Utd beat Brighton 2-0 on Saturday
The 55-year-old blamed his squad for the exit which leaves his only chance of silverware now lying in the FA Cup.
The Red Devils were drawn against Tottenham in yesterday’s semi-final draw.
And Mourinho knows victory will set up a final showdown with either Chelsea or Southampton.