Neither Stevenson or Martin have played much in the way of first team football for Swindon since joining last summer, and goal keeper Bart Griemink lost his spot as Swindon's number 1 back in August after Rhys Evans claimed his spot.
Griemink joined Swindon in 2000 from Peterborough, after playing on loan the season before he signed, and was mostly Swindon's number one 'keeper losing his spot in 2002 to Steve Mildenhall, but regaining it after Mildenhall moved to Notts County.