According to the newspaper As.
Real Madrid soccer team
The plan is to officially announce Mbappe's signing before the Euros, but he will not make his debut at the Bernabeu until July.
The French team is scheduled to play two Euro warm-up matches against Luxembourg and Canada in early June, and players such as Mbappe will begin training with the French national team on June 3rd. Due to the Bernabeu stadium in early June before and after the arrangement of a large number of commercial performances, so Mbappe in the European Cup before the appearance of the Bernabeu is less likely.
At the moment, it seems most likely that Real Madrid will arrange for Mbappe to make his debut as a member of the squad at the Bernabeu between July 15th and 18th. This could be brought forward to early July if France make an early exit from the Europa League.
