The Arsenal man, who is fully fit after a hamstring injury scare, is desperate to face Italy in Kiev but is content to wait for his chance as long as England keep grinding out results to stay in the competition.
Walcott said: "I had that little injury setback. I kept on playing and training and pulled it in the end so I thought, during training, I'd have to sit it out for a while.
"But I'm ready to go. I'd do anything for this team - from the start or the bench.
"It's nice to be part of it and there's still a lot more to come."