Webb in for injured Williams
Wales have been forced to make a change among their replacements for the RBS 6 Nations clash against Italy in Cardiff on Saturday.
Uncapped Ospreys scrum-half Rhys Webb will take over from an injured Lloyd Williams, the Welsh Rugby Union has announced.
Williams, who was scrum-half understudy to Mike Phillips at last autumn's World Cup and throughout the current Six Nations campaign, suffered a thigh strain in training this week.
Webb, 23, is in his fifth season at the Ospreys and has played for Wales at under-18 and under-19 levels.