Wales centre Jonathan Davies is set to miss the 2018 Six Nations after being ruled out for six months by a foot injury suffered in defeat by Australia.
The British and Irish Lions player suffered the injury as Saturday’s game drew to a close in Cardiff.
Harlequins centre Jamie Roberts has been added to the squad along with prop Scott Andrews.
Davies is to have surgery and Wales said: “It is envisaged that recovery will be in the region of six months.”
That timescale could mean Davies’ domestic season has already ended for Wales and Scarlets.
Wales hope Ospreys duo, scrum-half Rhys Webb and flanker Justin Tipuric, will be fit for the forthcoming Saturday match against Georgia in Cardiff.
Scarlets prop Samson Lee also missed the Australia defeat with an Achilles injury and is still being monitored, with Andrews, currently on loan at Bath, being called into the squad to train.
Davies’ Scarlets team-mate, wing Steff Evans, was replaced in the second-half against the Wallabies by Hallam Amos after scoring Wales’ first try.
In the game’s immediate aftermath Wales coach Warren Gatland played down injury fears over Evans.
“He’s fine, he’s just got a knock on the knee,” said Gatland.
“It wasn’t an injury replacement.
“He’s run himself into the ground and taken a couple of big hits.
“We felt it was about the right time to make a change.”