"Due to the continued uncertainty regarding air travel being affected by the volcanic ash cloud, it has been agreed to implement contingency plans regarding the appointment of match officials to ensure that the crucial Round 18 Magners League games can take place this weekend.
The appointments for Friday night are as follows:
Ospreys v Newport Gwent Dragons – Nigel Owens (WRU)
Scarlets v Glasgow Warriors – James Jones (WRU)
Ulster v Connacht – Dudley Phillips (IRFU)
The situation will be kept under review over the weekend."