Phil Jagielka and Ross Barkley have been named in the England squad for, but Leighton Baines is out due to injury.
England play the Republic of Ireland in a friendly in Dublin on Sunday 7 June, before playing Slovenia in a Euro 2016 qualifier on Sunday 14 June.
England squad in full - Goalkeepers: Green, Hart, Heaton. Defenders: Bertrand, Cahill, Clyne, Gibbs, Jagielka, Jones, Smalling. Midfielders: Barkley, Delph, Henderson, Lallana, Mason, Milner, Sterling, Townsend, Walcott, Wilshere. Strikers: Austin, Rooney, Vardy, Welbeck.
Roberto said: "It wasn't a big surprise because Ross hasn't been involved with the Under-21s. There has been a lot of talk but the call is right.
"Gareth Southgate has got the team together and with a winning mentality through the qualifying rounds, and it makes sense to carry on with that team going into the Finals.
"Remember, those Finals are there to prepare young players for the senior competitions. Ross has already been involved in the biggest of those, the World Cup.
"I fully support the decision 100 per cent and it is the right call to allow Ross to carry on helping the senior team.
"Then he needs a good break because the last two seasons have been demanding. He hasn't really had an opportunity to refresh himself. It's the right call for everyone involved."
Email Bluekipper at firstname.lastname@example.org