Following retirement, he later became manager of non-league side Bishop's Stortford, before moving to China as the goalkeeping coach for Shanghai Shenhua in 2012.
During the early 1990s Walker was mainly used as the reserve keeper, making the odd cup appearance along the way, but after a serious injury to then Spurs keeper Erik Thorstvedt Walker took his chance and soon became the number 1 at Spurs, cementing his place in the side and getting his chance in the team during the first season of the Premiership making a total of 17 appearances in the league.
Walker went on and made a total of 312 appearances for Tottenham Hotspur and played a big part during the 1999 season in helping Spurs win the 1999 Football League Cup Final after beating Leicester City 1–0 at Wembley Stadium.
During the latter stages of Walkers career at Spurs he fell out of favour with the management and lost his place to the newly signed Neil Sullivan it was shortly after this, that the England international handed in a transfer request in September 2000.
[9] Walker put up such a poor display in the match that he was confronted by a Leicester fan who ran onto the pitch, telling him he "didn't think he was fit to be a Premiership player.
[12] He did make a comeback performance in a goalless home draw against Wolves on 28 February,[13] putting up a "world-class save" to deny Kenny Miller.
His most infamous game was against Italy in a qualification match for the 1998 World Cup where he is widely believed to have been at fault to a Gianfranco Zola strike.
[18] Despite Walker's club Leicester suffering relegation from the Premier League, he played his first England match in seven years as a 61st-minute substitute for Paul Robinson in a 6–1 win over Iceland on 5 June 2004, which was also his last international.
[citation needed] In April 2012, Walker joined his former Bolton teammate Nicolas Anelka at Chinese Super League side Shanghai Shenhua and became their goalkeeping coach.