Penrith-born Ulster and Ireland utility back Will Addison has been ruled out for the rest of this season after undergoing a back operation.

The 26-year-old, who joined Ulster from Sale Sharks last summer, has not played since January because of a back injury.

He qualifies to play for Joe Schmidt’s side through his Fermanagh-born mother, despite being an England Under-20 international, and played his part in Ireland’s November internationals.

Former Upper Eden and Penrith player Addison made his debut in a 54-7 win over Italy at Chicago’s Soldier Field, before he started in their 28-17 success against Argentina and a 57-14 victory against USA at the Aviva Stadium.

Addison, from King's Meaburn, was included in Ireland Six Nations squads but didn't feature in the tournament.

An Ulster statement read: "Stuart McCloskey sustained concussion in the game versus Glasgow Warriors and will follow the return to play protocols. 

"Will Addison has had recent back surgery. It is hoped that he will return to full fitness for pre-season."

Ulster are currently second in the Guinness PRO14 Conference B table, just two points ahead of third-placed Benetton with Edinburgh, in fourth, a point further back.