NEWPORT Gwent Dragons’ promising utility back Hallam Amos looks a good bet to make his Wales debut against Tonga on Friday night.

Wales’ record 40-6 victory over Argentina at the Millennium Stadium was tainted by yet more injury worries as they face a crisis at centre.

New cap Cory Allen, 20, has suffered a suspected dislocated shoulder, while his midfield partner Scott Williams left the ground with his right foot in a protective boot with toe ligament problem.

With showdowns against Tonga and Australia still to come this month, the Six Nations champions are already without British and Irish Lions midfield duo Jonathan Davies, Jamie Roberts as well as wing Alex Cuthbert, the trio are all out through injury.

Wales will have to reshuffle and rest players for Tonga’s visit, Monmouth School product Amos looking odds on to win his first cap at the age of 19 as Warren Gatland runs out of midfield options.

The Stockport-born medical student, who has represented Wales Under-20s, can play at full-back and on the wing, James Hook now looking like he may plug the gap in the centre, while No 15 Leigh Halfpenny might be rested for the Australia game on November 30.

"We think Cory's injury is a dislocated shoulder. It is a shame," the Wales coach said.

"And Scott Williams might have done a ligament in his toe. We are kind of a bit short at the moment. Owen Williams comes back into training next week, and we will see what the prognosis is with Scott."

Despite the latest injuries, Wales were delighted after a bright display secured their first autumn series victory since they defeated the Pumas four years ago and it eased the pain of last week’s 24-15 setback against South Africa.

"I think from a coaching point of view, we are pretty happy," Gatland added.

"We felt like there were a few chances we left behind, but apart from that, we finished things off. We started the game well, we were much better in the air and our scrum and lineout was excellent.”

Gatland added: "We went in with the ambition of not conceding any tries, and we achieved that goal.

"We give the players a framework to work in, but that doesn't mean we want them stifled in any way to play rugby and to play what is in front of them.

"If they see opportunities to move the ball and challenge them, we want to encourage them do that.

"I thought we went out there with the ambition and intensity to put a good (Rugby) Championship team away."