The 20-year-old, who joined Boro on a free transfer from non-league Darlington, has scored in his last two games, including the winner against Leeds in midweek, after returning from a five-month injury lay-off.
Mowbray told the club's official website: "He came here on trial and trained with the youth team, and you could see the power and speed he's got.
"His finishing with both feet is breathtaking at times. Whether the ball drops to his right foot or left foot, he doesn't hesitate.
"He's got amazing qualities and yet he's such a young player, he doesn't know the game and hasn't really been educated about football and it's going to be a process for him.
"But he is potentially a really, really special talent."
Middlesbrough last week