His playing career spanned some 1,000 league and cup games for Chelsea, Sunderland, Fulham and Brighton & Hove Albion before enjoying a renaissance in the Conference with Woking and Cheltenham Town.
With Chelsea facing relegation to the Third Division in 1982–83, and with it potential financial meltdown, Walker also scored a late winner against fellow strugglers Bolton Wanderers in the penultimate game of the season to ensure the club's survival.
Walker left Chelsea at the end of the 1983–84 season following a contract dispute, and signed for Sunderland.
In the final at Wembley, however, Sunderland lost 1–0 to Norwich City, with Walker missing a penalty when he hit his shot against the post.
[2] He currently works as an analyst for the radio station BBC London 94.9 and is a co-director of Sporting Experience with Jason Cundy.