Stuart Olding's availability for Ireland's summer tour to the United States and Japan has been thrown into doubt.
The Ulster centre is to see a specialist after suffering an injury to his left ankle during last week's loss to Ospreys.
Ireland will face USA Eagles at Red Bull Arena in New Jersey on June 10. It's the first time the two sides will meet since Ireland's victory over the Eagles in the summer of 2013.
After this, Ireland travel to Japan for games against the 2019 Rugby World Cup hosts on June 17 and June 24.
Meanwhile for Ulster, Ruan Pienaar may have played his last game for the province. 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 that they will be able to return to the matchday squad for this weekend.
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