He transferred to Colchester United nominally in 1961,[1] making his professional debut on the opening day of the 1961–62 season in a 3–0 victory over Stockport County at Layer Road.
[2] He scored his first goal for the club on 26 August during a 2–2 draw away at Oldham Athletic.
[3] During his single season with the U's, Foster made 36 league appearances, scoring eight goals[4] and assisted Colchester to promotion to the Third Division.
[7] Foster left Colchester for Norwich City for £3,000 in the summer of 1962 in a deal that also saw Roy McCrohan head to the U's.
[1] He failed to break into the first-team at Norwich and did not make any appearances for the club.