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 spent a significant portion of his football career with Charlton Athletic, after joining from AFC Bournemouth in 1977. During his first time at Charlton, he went through one relegation to the Third Division (1980), one promotion to the Second Division (1981) and one promotion to the First Division (1986).