"The step to the Premier League will do him good. He will be playing with the best players every day and that is a new challenge for him. I think he will do well there.
"He will have to get used to the amount of games and the physical side but in the end he will succeed, for sure."
De Jong added: "They are still saying that he has a problem with his physicality.
"That is what everybody is saying right now but they were saying the same when he came from the academy at Heerenveen. They said the same when he went to Twente – problem with his physicality. Same thing at Ajax. So I don’t think it’s a problem.
"I have absolutely no doubts. He is going to beat the next challenge."