Stuart Olding a serious doubt for summer tour

Stuart Olding's availability for Ireland's summer tour to the United States and Japan is in serious doubt.

The Ulster centre is to see a specialist after suffering an injury to his left ankle during last week's loss to Ospreys.

Ruan Pienaar may have played his last game for the province, as a back issue makes him a serious doubt for Saturday's season-ending derby with Leinster.

Charles Piutau and Stuart McCloskey are both undergoing treatment, with the hope being they'll be fit for the game at Kingspan Stadium.