"He was young and it was quite a big jump for him for that kind of money. We've gambled on young players in the past, a couple of million, something like that.
"But when you get to that level of £35m, you need to do a bit more homework and see how he is in the second season, maybe.
"Now it's up to the boy to improve himself. He's a great header of the ball and very aggressive. He'll be a handful on Wednesday.