They may be battered and bruised after a stunning Rugby World Cup victory over England at the weekend, but Wales will look to come out fighting once again when they take on Fiji in Pool A on Thursday.

Warren Gatland's men looked to be on the ropes at Twickenham when injuries to Scott Williams, Hallam Amos and Liam Williams left them fielding a host of players out of position.

But the men in red showed remarkable resolve and determination to come away with a 28-25 win - Dan Biggar delivering the knockout blow from the tee before a controversial call to kick for touch garnered no reward for the hosts.

Gatland has patched up his squad by bringing James Hook and Gareth Anscombe in for Scott Williams and Amos, but will not have welcomed such a quick turnaround following a physical bout.

Having seen off one Pool A heavyweight, Gatland will be keen to avoid an upset against Fiji and roped in the help of legendary Welsh boxer Joe Calzaghe to help inspire his charges.

"Joe and his old man [and trainer Enzo] spoke really well," said Matthew Morgan, who takes the place of Liam Williams in the starting XV after the full-back sustained a concussion against England. 

"He said he always liked to be the underdog in every fight he went into, but he obviously came out on top all the time. I do watch a bit of boxing and I did watch some of his fights when I was younger."

Bristol's Morgan comes in as one of three enforced changes to the side that started at Twickenham, with Tyler Morgan replacing Scott Williams and Alex Cuthbert coming in for Amos.

"I'm obviously really excited about being given the opportunity," he added. "It's a shame Liam took the knock, but he has been supporting me this week.

"He sat down with me and went through a couple of things and helped me out. He has always helped me, ever since I came into the camp. Having said that, half the time he doesn't know what day it is.

"I was over the moon when I was told I was starting. I actually struggled to fall asleep last night, so I spoke to the doctor and asked if he could help me out to sleep tonight. I'm looking forward to the occasion."

Wales and Fiji are familiar foes at the World Cup, with the nations having also met at the last two tournaments - the former suffering their only defeat in 10 matches against the Pacific Islanders in 2007.

A 66-0 win in the 2011 pool stage atoned for that slip-up, but the last clash between the sides in Cardiff proved to be a much tighter affair, with Wales holding on for a 17-13 victory in November.

Nemani Nadolo scored all of Fiji's points on that occasion, but the powerful wing will miss this week's fixture after being penalised for a tip tackle.

A win for Wales would leave England needing at least a draw against Australia on Saturday to keep their hopes of reaching the knockout stages alive.