Phil Jones, Chris Smalling and Tom Cleverley all accompanied Rooney to England's training base in Watford ahead of Friday's qualifier with Bulgaria in Sofia, and striker Danny Welbeck would almost certainly have joined them had it not been for the hamstring injury he sustained against Arsenal at the weekend.
It is not unknown for younger players to struggle for consistency but, having worked alongside such talent at close quarters for the last couple of months, Rooney is adamant it will not be a problem.
KEY PLAYERS
"They could be key players at Euro 2012," he said. "They have done well for the Under-21s in the tournament just gone.
"The manager has recognised that and brought them into the squad. We didn't do much in training but you could tell they were comfortable around the other players.
"They know a few players here and have settled in quickly. Hopefully they will get a chance and do well."