A brief spell with the U21s would have proved ideal preparation ahead of the youngster's return to the senior side, following his hat-trick heroics in England's 4-1 win in Croatia last year.
How long Walcott will be ruled out for has yet to be confirmed, but the winged wonder knows that time is still on his side.
"I can only just work hard and try to get to the level where I was before and I'm sure I'll do that with hard work," he said. "I've just turned 20 and I still want to play for the England U21s, and we'll see what happens with the full squad.
"Every time you play for your country there's obviously a lot of pressure anyway. I haven't got ahead of myself or got all big time. I'll never be like that. That was a brilliant night. It sort of all reflected back to me, but the whole team were absolutely fantastic, the fans especially - they were so loud."
Walcott also revealed how he is now feeling much more comfortable in the England set-up, and feels that the players' good relationships off the pitch are helping improve performances on it.
"It's sort of second nature to me now and I've got to know all the lads better," he said. "We bond quite a lot, we play golf now and then with each other, a bit of PSPs (computer games), and we watch DVDs together.
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