Gritt spent most of his playing career with Charlton Athletic, after joining from home town club AFC Bournemouth in 1977. In his first spell with Charlton, he experienced one relegation to the Third Division (1980), one promotion to the Second Division (1981) and one promotion to the First Division (1986).
Gritt's football career was primarily spent with Charlton Athletic, after joining from AFC Bournemouth in 1977. During his initial time at Charlton, he experienced a relegation to the Third Division (1980), a promotion to the Second Division (1981) and a promotion to the First Division (1986).