I think he has enough about him at 19 to think he is worth investing in. He is big, has good technical ability and a decent engine. He will surely improve considering his age and will only get stronger as he gains muscle. He is not wispy as Own was at 19, he is not “chubby” as Rooney was at the same age, he has the body type that will improve with age, especially for a midfielder. He got injured last season and I think it affected his performances but as the season went on he played better. Problem for him is he is more an attacking midfielder than a defensive midfielder and we have a number of those. I cannot see him playing the Fabinho role.
That said, he will probably be included in the England squad and a main stay in the team. I think he will stay and not a candidate for going on loan this summer.