Tomos Williams has been called up to Warren Gatland's NatWest Six Nations squad following a knee injury to Rhys Webb.
The Ospreys scrum half has been released from the Wales National Squad, and Williams joins fellow Cardiff Blues squad members Ellis Jenkins, Seb Davies, Dillon Lewis, Alex Cuthbert, Gareth Anscombe and Josh Navidi in the set-up.
Williams was part of Wales' squad for the 2017 summer tour, where they took on Samoa and Tonga, but remains uncapped having not made an appearance in either Test.