Wallabies coach Dave Rennie sweating on Samu Kerevi fitness

Wallabies coach Dave Rennie has been left sweating the fitness of star centre Samu Kerevi after the 28-year-old hobbled off the field in the Wallabies 32-17 win over Argentina on Saturday night.

Only 10 minutes after scoring an impressive try in the second half, Kerevi was forced to limp off the field with a suspected ankle injury before he was seen on crutches at fulltime.

Rennie attempted to brush off the seriousness of the injury during the post-match press conference, but it could be possible the centre could miss the opening matches of the end of year tour, or miss the tour completely.

"[There are] question marks around Samu," Rennie said. "It used to be called sprained ankle in my day, now it's called syndesmosis which is much worse evidently.

"We're hoping that it's not too long, so we'll assess that as we go."

Wallabies medical staff are waiting on the results of Kerevi's scans before making a call on his availability.

Rennie wouldn't comment on how many players or who would make the touring squad on Saturday night, but Kerevi's absence would be a huge loss for the team after he helped straighten out the struggling backline and led the Rugby Championship in defenders beaten, offloads and carriers.

"We'll see how we come through," Wallabies coach Dave Rennie said. "Obviously [there are] question marks around Samu and there will be a few bumps and bruises that we'll have to have a look at."

The Wallabies open their tour against Japan in Oita on October 23, before heading to the UK for three Test against Scotland, Wales and England.

Following an impressive turnaround that saw the Wallabies bounce back from three straight losses to the All Blacks to defeat the Springboks and Pumas twice, Australia now have 10 days to assess any injuries and prepare for another month on the road.

"This tour is a great opportunity for us," Wallabies captain Michael Hooper said. "A lot of our guys haven't been up north [northern hemisphere], and we've got a World Cup there [in France] in two years. "To have the opportunity to play in front of hopefully full stadiums is great for everyone, and playing different teams will present different challenges."