The versatile Foster joined Wycombe in the summer of 2010 following a year-long stay with Brentford, where he made 36 appearances in League 1 prior to his switch to Adams Park.
A former Tottenham trainee, Foster earned promotion to the Football League during a five-year stint with Dagenham & Redbridge, and played a vital role in the Blues’ rise to League 1 last season, playing 40 times and scoring once.
That form prompted manager Gary Waddock to reward him with a new deal which will keep him in South Bucks until 2013.
Made 10 appearances last season before picking up a knee injury.