Ben Gibson has signed a new four-year deal with Middlesbrough.
The central defender has made only one appearance for Boro but has gained experience during loan spells with Plymouth and York.
The 19-year-old had been enjoying a stint at Tranmere this campaign but has returned to the North East to receive treatment for a troublesome abductor problem.
Manager Tony Mowbray told the club's official website: "He's done extremely well at Tranmere.
"At some time in the next year or two, Ben Gibson is going to be knocking on the door of the first team.
"He's a very, very mature young guy who's very focused and knows what he wants from his career.
"In terms of talent, composure and ability, it's all there."
