After joining the Rebels from Aldershot last summer, Klass made 32 appearances for the Reds in all competitions this season.
The 25-year-old had an extended run in the team between January and February, his longest run of consecutive appearances this season, before his suspension that kept him out of contention for the encounters with Chelmsford and Taunton.
Since then, Klass featured at Chippenham but was left out of Racine’s squad against Bath City on Sunday and the midfielder now moves onto pastures new with Maidstone United.