The United manager was responding to stories that England’s governing Football Association were keen to include Premier League stars, such as Rashford, in their Under-21 squad for the tournament in Poland in June.
Mourinho has no problem with Rashford, who turns 19 on the last day of this month, being a part of that squad – but only if he has not established himself in the senior set-up.
“We are in mid-October, the Championships will be in the summer,” United manager Mourinho said Wednesday.
“I think we have to wait and see what happens until then. Because if the player becomes a regular in the ‘A’ national team, if you want to call it that, then to say it is important for his development (to be) with the Under-21s, makes no sense.”