"He was a magician," he says in the video below.
"One of the best, if not the best player I've ever had the chance to play or train with. I'm lost for words that's how good he was."
Walker's biggest selection headache came up front, where he was forced to choose between two "fox-in-the-box" strikers ideal for five-a-side football.
See: All PL five-a-sides