Late change on the bench for Ospreys

James Hook is a late withdrawal from the 23 originally named to face Leinster at the RDS Showground tonight

He has withdrawn at short notice due to a back spasm, although the Ospreys remain optimistic about his prospects to recover fully for the Heineken Cup fixture against London Irish next week.

Tom Prydie comes in, wearing the 23 shirt, with Gareth Owen switching to 22.