Marc Wilson has signed a new three-year deal with Portsmouth.
The 20-year-old Irishman is yet to appear for the Pompey first team, but has enjoyed loan spells at Luton, Bournemouth and Yeovil.
Wilson started life as a midfielder, but has recently converted into a central defender.
Wilson said: "The plan is to push on and break into the first team. I'd love to play European football."