Gareth Anscombe will make his first international start in a Wales side showing six changes for their Rugby World Cup Pool A decider against Australia at Twickenham on Saturday.

The versatile New Zealand-born Anscombe, who was drafted into the squad as a replacement for injury-hit Wales, will start in a new-look back three alongside Alex Cuthbert and Liam Williams.

Williams was passed fit after missing the victory over Fiji last Friday due to the concussion he suffered in the victory over England.

George North moves to outside centre to partner Jamie Roberts, while the fit-again Paul James returns to the front row and Luke Charteris also starts. 

Captain Sam Warburton moves to blindside flanker for a game Wales must win to ensure they top the pool and face Scotland or Japan in the quarter-finals rather than Pool B winners South Africa.

Wales head coach Warren Gatland said: "Saturday is another huge encounter and both sides will be coming in with momentum and looking to top Pool A.

"We have been impressed with Australia so far in this competition and we know a step up is required at Twickenham this weekend. It is still all to play for in terms of the knock-out phases.

"We've trained well this week, had a full squad to pick from and it is great to welcome back players from injury."

Wales team: Gareth Anscombe, Alex Cuthbert, George North, Jamie Roberts, Liam Williams, Dan Biggar, Gareth Davies; Paul James, Scott Baldwin, Samson Lee, Luke Charteris, Alun Wyn Jones, Sam Warburton, Justin Tipuric, Taulupe Faletau. 

Replacements: Ken Owens, Aaron Jarvis, Tomas Francis, Jake Ball, Ross Moriarty, Lloyd Williams, Rhys Priestland, James Hook.