Keith started his career at West Ham United as a trainee but did not make a senior appearance.

He joined Colchester United in 1999 and went on to score 28 goals in 247 league and cup appearances for the club in six seasons.

[2] After a brief loan spell with Bristol City at the end of the 2004–05 season,[3] Keith was released by Colchester and joined Leyton Orient in June 2005.

Keith was instrumental in helping the Dockers win their first silverware since 1975 when they won the Isthmian League Cup, beating Harrow Borough 2–0 in April 2009.

[9] After a spell as a coach with East Thurrock United he joined local rivals Canvey Island as assistant manager in February 2016.