 Since retiring as a player, Walker has become a television pundit.Walker started his professional career with Motherwell in 1984, helping the club to gain promotion before moving to Celtic in the summer of 1987 for a fee of £350,000.His first season at Celtic Park was hugely successful, as "the Bhoys" won the double in 1987–88, their centenary season, and Walker himself earned a first Scotland cap against Colombia.