DAN BIGGAR and Liam Williams have been passed fit to start Wales’ World Cup quarter-final against Argentina tomorrow.

Biggar has been struggling with a chest injury and Williams (pictured above) was a doubt because of a knee problem, but they have been given the all-clear for the Stade Velodrome showdown and start at fly-half and full-back respectively.

Aaron Wainwright moves across from blindside flanker to fill the void at number eight created by Taulupe Faletau’s injury, while skipper Jac Morgan takes the number six shirt.

Tommy Reffell comes in at openside to complete the back row adjustments against the Pumas.

Wales head coach Warren Gatland believes his team have yet to hit top gear despite their pleasing progress through Pool C.

“We had a goal of making the quarter-finals, which we have achieved. Now it’s about building on that momentum,” Gatland said.

“We’re very much relishing the opportunity. We’re expecting another tough encounter this weekend against a physical Argentina side.

“We haven’t had the perfect performance yet, but we have shown that we are a hard team to beat.”