He was also given 14 when he made himself available for the Under-21 squad, despite establishing himself in the seniors.
"I didn't expect to get it but it's an absolute result," Walcott said.
"It doesn't really matter what number is on the back. As long as it's an England shirt I'm happy.
"So they told me 14 and I said 'yeah, I'll have that' not realising it was Thierry's number until I got home. It's just a number but he's a great player to live up to. That's the pressure. That's no problem."