A Liverpool fan whose role model is Fernando Torres, Wickham spent four years on Reading's books, living in Aldershot, before his father's job in the Army led them to Colchester and trials with Ipswich.
"He's a very level-headed young man," England U17 coach John Peacock told The Times. "I think he's at the right club and Roy's done a really good job with him, steadily developing him. He's a goalscorer but he's matured a lot in his build-up play.
"Physically he's a real specimen of a young man so it's no surprise he's dealing with the physical demands of Championship football. He's had a lot of accolades this year but he's dealt with it all in a very mature manner. Within this peer group, he's just one of the 18. That can only be of benefit to the team."