The 20 year old was on target for the England under-21 side during their win on Friday against Ukraine before Gareth Southgate announced his inclusion in the Three Lions squad. "The senior players are very open, very welcoming".
"So it's a different challenge for us, as you'd expect we are playing the best team in the world who have annihilated everyone in the South American qualification which is the hardest way to the finals".
'Those (three new) guys have fitted in off the field no problem which helps them to fit in on the field - and they're good players, so in training they look fine. "They've got good pedigree, and we won't hesitate to put them on the pitch".
Prince Charles takes over Remembrance Sunday duty as teary Queen looks on
However, as he is no longer a serving member he is not required by the Ministry of Defence to comply with the Army's regulations. The 33-year-old was sporting a beard - something that is forbidden in the British Army, except in a few rare circumstances.
England finished top of their own group in the European section, and Southgate says he could name a squad as soon as tomorrow for football's showpiece tournament.
The Three Lions played out a goalless draw against Die Mannschaft on Friday and continue their preparations for the 2018 World Cup with another friendly worldwide against the Samba Kings tonight.
"You had four or five FA Cup games that went to replays instead of going to shootouts, so we were used to having hundreds of matches on boggy pitches but we weren't used to being under that pressure. But clearly that (match situation) is an option". One of the most frustrating aspects of England's play in recent times has been the consistent sideways passing of the side as they try to play the Dutch, Spanish or Italian way - and fail.
"It's something that we are considering how we prepare best for penalty shoot-outs", he said.