"I thought Leon was a big positive," he told the West Brom website. "Leon is a young boy, who not much more than a year ago was playing at a lot different standard when he was competing to stay in the Championship.
"He's made a huge jump and he's coming on leaps and bounds every day. There is a bright future for Leon on the evidence of playing against those players on Saturday.
"He did exceptionally well. Part of any player's job as you go along is to learn.
"Any defeat, bad performance is not the end of the road.
"You've got to get back to training and try to learn those lessons to make you better in the next game.
"I'm sure Leon will do that."