"Jay's got to find his feet with us," Mowbray told WBA's website. "But he's looked good in training and is a young boy looking forward to the challenge.
"It's not easy coming into a game like today where the expectation is different from most weeks.
"But he'll be fine for us.
"He's a good lad and has got a good attitude to the game.
"He'll fit in well."