Mourinho is still without a number of players, who reached the latter stages in Russia, and made clear his preference that they cut their breaks early to aid preparations for the season opener against Leicester on August 10.
The rescheduling of that match to a Friday compounded the United manager’s frustrations over the early start date of a season that for the first time will see the summer transfer window end before campaign begins.
“I agree that when the Premier League starts, the transfer window close,” Mourinho said. “I agree with that.
“I am not a big fan of some player to start the Premier League with one club and a couple of weeks later the transfer window is still open and he moves to another club and he plays against his former club. I really don’t like that.
“I agree totally with the window closing at the same time the Premier League starts.
“What I don’t agree is that the Premier League starts now.
“You look to other countries and the countries with lots of players in the World Cup, they start later.
“You look to Spain, to Italy, they start later, and the Premier League could, should do that.”