Overview
- The Scarlets fly-half suffered an ankle injury against Scotland and will not travel to Dublin for Friday’s match.
- Ospreys playmaker Dan Edwards is expected to start at fly-half, with Jarrod Evans set to provide bench cover.
- Backs coach Matt Sherratt says Costelow is likely to be available for Italy in Cardiff on 14 March.
- Head coach Steve Tandy must also replace flanker Taine Plumtree, who has been ruled out of the tournament.
- Prop Keiron Assiratti and flanker Ryan Woodman have been added to the squad as Wales try to halt a 14-match Six Nations losing run.