The Guinness Pro12 semi-final referee, assistant referee and TMO appointments are as follows:
Leinster v Ulster
Referee: Ian Davies (WRU)
ARs: Ben Whitehouse (WRU) & Sean Brickell (WRU)
TMO: Jon Mason (WRU)
Connacht v Glasgow Warriors
Referee: Marius Mitrea (FIR)
ARs: Nigel Owens (WRU) & Stefano Penne (FIR)
TMO: Carlo Damasco (FIR)