Manchester United have a number of key players who have featured at the World Cup, including England's Marcus Rashford, who played in the third-place playoff against Belgium on Saturday, and midfielder Paul Pogba, who will line up for France in the final on Sunday.
"The future for [Pogba] in the French national team, among that fantastic group of players, can only be brilliant".
De Gea and Matic were among 12 United players to compete at the 2018 World Cup, and they have all been given time off following this summer's tournament.
Jose Mourinho says "it is a shame" for the Premier League that the start date this season means many players at the World Cup in Russian Federation will not have enough rest time to be fit for the opening fixtures.
"It's important for him to understand why he was so good in the second part of the competition". I have to respect the United States authorities in their process of selection for visas. "I sent a nice message before the World Cup (but) during the World Cup, I decided not to disturb anyone", he said.
United play the first match of their U.S. against Mexican side Club America in the early hours of Friday morning BST.
Mourinho, speaking in Los Angeles, said: "I did with Paul what I did with all my players".
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Spurs have been credited with an interest in Croatia star Ante Rebic, according to German publication Sport Bild, and whilst the Eintacht Frankfurt ace would be a welcome addition to Pochettino's squad, the Argentine might just be better served in making a move for his worldwide teammate Ivan Perisic instead.
Yet Mourinho said: "The pre-season is very bad".
"But we have to try to make the best out of it and work with the players we have here".
"So if Alexis is not working with us for another 15 to 20 days that will be bad".
Mourinho is also without Diogo Dalot, the 19-year-old full-back signed from Porto for £19m, because of injury.
Meanwhile, new Chelsea boss Maurizio Sarri has spoken of his excitement at facing numerous world's leading managers now that he in charge of a Premier League side.
"I don't think I would still be involved right now if the manager didn't believe in me".