Walcott is backing Rooney to "make up for lost time" during the remainder of Euro 2012 despite the contribution of Andy Carroll and Danny Welbeck to the 3-2 win over Sweden on Friday night.
He 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."