Samu Kerevi will be racing the clock to be fit for the Spring Tour after suffering a suspected ankle injury during the 32-17 win over Argentina.
Kerevi was taken from the field after 51 minutes during the bonus-point victory, replaced by Tom Wright.
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He was spotted after the game on crutches, with Rennie confirming he would head for scans on Sunday.
“There are question marks around Samu (Kerevi),” coach Dave Rennie said in his post-match press conference.
“It used to be called a sprained ankle in my day. It’s now called syndesmosis, which is much worse evidently.
“We’re hoping it’s not too long.”
A spokesperson for the Wallabies confirmed he remains a chance to tour as they review the scans.
Kerevi and the Wallabies will next play Japan on October 23 after a brief stint at home, with the Suntory centre receiving clearance to stay for the remainder of the Spring Tour.
It will be a welcome return for players, who have been on the road for 109 days, beginning with the France series.
Captain Michael Hooper admits whilst the majority of the time will be spent at home, he couldn’t hide the excitement about having some time off after featuring in nearly every minute for the Wallabies so far.
“I can’t wait,” Hooper said on the potential of returning home.
“One hundred and nine days away in this block and everyone has deserved a little rest.”
Rennie confirmed they will look to name their squad for the Tour later in the week, with the expectation they will take 35 or 36 players to Europe.
He refused to hint on whether they would call upon European-based players, with the likes of Will Skelton, Rory Arnold and Tolu Latu speculated to return.
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Skelton said during the week he would be open to returning to the Wallabies if called upon, recently nominated for Player of the Year voting in the French Top 14 for La Rochelle.
"Obviously, not being eligible is tough, not being able to put your hand up to play," Skelton told AFP this week.
"If the opportunity does come along I'll definitely put my hand up. You can see how well they're playing at the moment and you miss that environment, the international field."