Clark told the Huddersfield Examiner: "He's progressed nicely and the experience he gained at Bradford will be of great benefit.
"Simon is back working under our goalkeeping coach John Vaughan and we're lucky to have two very good young keepers. He's more than capable of playing first-team football.
"If I didn't think that I wouldn't have let Matt Glennon move. Simon isn't just here to be back-up. I want him to challenge Alex for the shirt, and he's capable of doing just that."