Robbie Henshaw has been ruled out of Ireland's test against South Africa tomorrow.
The Leinster centre has picked up an injury problem.
Ulster's Stuart McCloskey comes into the team and will wear the number 12 shirt.
Jimmy O'Brien will take McCloskey's place on the bench.
Kieran Treadwell is the latest Ulster player committing their future to the province.
The Ireland lock has signed a three-year contract extension, and will stay with Ulster until 2026.
Treadwell is providing second row cover on the Ireland bench for tomorrow’s test with South Africa.