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.

.@UlsterRugby confirm 'significant' ankle injury for @stuart_olding #SUFTUM https://t.co/694jiZGLjE pic.twitter.com/IeOgSJXych

— Irish Rugby (@IrishRugby) May 3, 2017

Ulster confirm a 'significant left ankle injury' for Stuart Olding.

The guy has absolutely no luck. Shame if he misses out on Ireland tour.

— Murray Kinsella (@Murray_Kinsella) May 3, 2017

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.