"I'm loving it here. The lads are as good as gold," Gray told Celtic View.
"At the moment I'm only here for four months but if something more permanent can be fixed up then I would be delighted.
"First, I would like to try to force my way into the team, difficult as that's going to be. I've said all along I'm not just up here to make up the numbers," he added.
"Since I got into the Sunderland side at 17 I've always been a first-team player and there is no way I intend changing that now."