"There's no situation, we brought some new players and I wanted to get them going," Mowbray told BBC Tees.
"Other players are getting opportunities, Scott just has to keep working hard and see what happens."
The Australian international netted nine goals in 36 games for the Teessiders last season.
"I want (Emmanuel) Ledesma to get going, it's a huge step up for him to the expectations of our club," Mowbray added.
"He's managed to score today and he's got a bit to do but he's worked hard and got a lovely nature.
"We talked about Luke (Williams) and he looked exciting late on drifting past people."
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