I don't know much about Veliz, but I saw a bit of him in the U20 world cup.
Good in the air, looked a goal threat. Not so involved in the buildup. I can't say he looked a superstar like, say, Aguero at that age, but he made enough of an impression that I remembered the name.
I like that they say he's a strong character, has scored in the big games. That will stand him in good stead coming to England at such a young age.