Speaking to BBC Radio 5, Walker praised his manager's influence on his career.
"He is the one who has made me understand football so much better," he said.
He added: "Do I think I could have played in a back three five years ago? Definitely not. I think my understanding of the game, my knowledge of the game - where the press is going to come from, learning to go into the midfield, to balance it off people, come in to receive the ball at the correct angle. So many little things you don't really hear of."
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