UNCAPPED centre Willis Halaholo has been called up to Wales' squad for the Six Nations along with Cardiff Blues teammates Lloyd Williams and James Botham.

Wayne Pivac has bolstered his options ahead of Saturday's clash with Scotland at Murrayfield, although the swift turnaround from Sunday's win against Ireland means he is likely to stick with his original squad members.

Blindside Dan Lydiate suffered a serious knee injury at Principality Stadium while centre Johnny Williams (head), wing Hallam Amos (head) and scrum-half Tomas Williams (hamstring) will all miss the trip to Edinburgh.

New Zealand-born Halaholo, who qualifies for Wales on residency, was called up to face the Barbarians in November 2019 but suffered a serious knee injury just after being selected and was sidelined for 11 months.

The 30-year-old has got the nod ahead of Jamie Roberts, who has been in fine form for the Dragons.

The physical 34-year-old was last capped in 2017 but Pivac has opted for the classy Cardiff man instead.

Roberts, whose fiancée Nicole Ramson is due to give birth in the coming weeks, is likely to be in PRO14 action against Edinburgh on Friday night rather than heading for the Scottish capital and closing in on a century of caps.

FINE FORM: Jamie Roberts has led the charge for the Dragons

FINE FORM: Jamie Roberts has led the charge for the Dragons

That came after former Scotland speedster Tim Visser called for Roberts to return to the Test scene.

"I started this campaign on Twitter," Visser told the Guinness PRO14's Under The Sticks podcast. "Get Jamie back in.

"The guy is playing the rugby of his life. The stuff he is piecing together right now is world-class, especially for someone of his age.

"He could definitely do a job there, just to run off nine and 10 and punch those holes and get Wales over the gain line."

Pivac will hope that George North is fit to continue his impressive start to the championship after suffering a scratched eye against the Irish.

He played at 13 and, with Dragons centre Nick Tompkins struggling with a shoulder injury, Owen Watkin could slot in at 12.

Amos' place is set to go to Liam Williams, who is back from suspension, while Josh Navidi is likely to start at blindside with Dragons back rower Aaron Wainwright coming onto the bench.

Lloyd Williams has been picked ahead of Ospreys scrum-half Rhys Webb and is behind Gareth Davies and Kieran Hardy in the pecking order.

Botham made an impressive start to life in Test rugby in the autumn when he played against Georgia, England and Italy.

Two Dragons - Tompkins and tighthead Leon Brown - came off the bench against the Irish while hooker Elliot Dee was an unused replacement.