The 22-year-old feels the influence of former Manchester United and England defender Neville is helping him develop still further.
Walker said: "I'm young, I want to improve, I want to become the best I can be and Gary Neville is really helping me with that aim.
"He a player I looked up to and watched often. He had a fantastic career. He gives me tips and coaches me through things. I'm excited to be working with him.
"I've always liked to go forward but he has helped massively in terms of myself improving defensively. I just want to keep on learning.
"My defending is improving every time, every week. I think it is just about experience and learning off people like Gary plus the likes of Joleon Lescott, Phil Jagielka and Gary Cahill.
"The decision-making has to be key. There is club level but then you step up to international level and have to be even more precise."