Wales have added uncapped scrum-half Tomos Williams to their squad for the remaining internationals and Cory Allen has been recalled following injuries sustained by Rhys Webb and Tyler Morgan.
Webb was carted off after damaging his ankle during Saturday's 32-8 defeat against Australia at the Principality Stadium and the scrum-half is awaiting the results of a scan to discover the extent of his latest injury.
Williams has been added to Rob Howley's squad for the Test against Argentina on Saturday, as well as clashes with Japan and Argentina in Cardiff.
The 21-year-old's Cardiff Blues team-mate Allen is in line for his first international appearance since the centre was injured against Uruguay after Morgan (hamstring) was released from the squad.
Wales were soundly beaten by the Wallabies last weekend and defence coach Shaun Edwards on Monday admitted Australia attack coach Stephen Larkham got one over on him.
"I will hold my hands up. I'm not happy with my performance. As a defence coach, I thought he got the better of me," said the Englishman.
"Anybody who knows me knows I'm a pretty determined person - it's about time we won a game."
He added: "I think we can defend better than we did against Australia.
"First and foremost, we lost the advantage line. Their two second rows, props and hookers consistently made the advantage line, producing quick ball.
"We gave penalties and lineouts away and had to defend 10 clean set-pieces in the first half. They could have scored five or six tries in it."