There was a great deal of concern as Giffin was stretchered off
Australia coach Eddie Jones has cast doubt on David Giffin's participation in the remainder of the World Cup.
The Australian lock is back in training after being carried off the field in a neck brace in his country's 24-8 win over Argentina.
Giffin was knocked unconscious and although X-rays later confirmed he had not broken his neck, a shoulder injury may force him out of the tournament.
Despite his return to the fold, Jones has admitted that Giffin could yet be ruled out for the forseeable future, although Australia's medical team will continually monitor his progress.
"We'll have a pretty good idea in the week leading up to the Namibia match whether he's going to recover from this shoulder injury or whether it's going to preclude him from playing in the rest of the tournament," Jones said.
"You don't really know 100% whether he is going to be right."
As a precaution Jones has called up Daniel Heenan from a list of reserve players. Heenan will train with the squad at their Coff's Harbour camp.
Giffin, the only survivor among the Australian forwards from the 1999 World Cup, had only recently returned to action after major shoulder reconstruction.
"It looks more spectacular than other head knocks when you come down from a bit of a height, but it's no more serious than any other head knock," Giffin said on the incident.
"I'm feeling fine, I've got no real problems, except the shoulder's a bit sore."