The return of striker Wayne Rooney after a two-game suspension, means not only that he will change a winning team following England's dramatic 3-2 triumph over Sweden in Kiev on Friday, but also that he will be forced to omit one of the young strikers he praised for their performance.
Both Andy Carroll, 23, and Danny Welbeck, 21, scored impressive goals, with a towering header and clever back-heeled shot respectively, to earn their manager's appreciation and confirm the arrival of a new younger generation.
Walcott said: "I am sure Wayne will get his opportunity. He'll want to make up for time he's missed - he will want to make it up to all of the lads.
"He is such a world-class player. It would be tough to leave him out but that's the manager's decision. We'll see what happens."
Despite his impact as a traditional centre-forward, Carroll looks most likely to make way in a move that could give England's offensive play greater fluency, particularly as Rooney, Welbeck and Ashley Young are club-mates at Manchester United.
"That chance was massive, but Danny made it look easy," he said. "It was class, probably one of the best goals at this tournament and I am not just saying that because he's my friend.
"That goal had everything and shows that, despite being at such a young age he can do the business."
"I have finally got that scoring monkey off my back, but I surprised myself. I thought the shot took a deflection which is why my celebration was a little bit odd, but I've seen it again and it didn't.
"I didn't know I had that sort of 'Ronaldo dip' in me. I should try it more often. To score is
