Socceroos midfielder Jackson Irvine sustained an Achilles injury overnight but his club Hull City are hopeful it won't lead to a long-term absence.
Irvine had to be replaced after 28 minutes in Hull City's 1-0 home loss to high-flying Leeds United in the Championship.
City boss Nigel Adkins said: “He got a kick on his Achilles so we’ll see.
“It’s not like Jacko not to finish a game. He’s tried to run it off. We’ll just have to wait and see if he’s available for the weekend.
“It wasn’t ideal because Jacko is one of our energetic players in the middle of the pitch. To lose him early doors wasn’t ideal."
The Tigers are up against Sheffield United on Saturday in the Championship with Adkins hopeful the Aussie will be available.
The 25-year-old Melbourne product has had a stop-start season for the Tigers after a pre-season illness and thigh injury last month but had been finding form in recent matches.
If fit, he is expected to be part of Australia's squad for this month's friendly with Kuwait ahead of the 2019 Asian Cup.
Elsewhere, Massimo Luongo put in a full shift as QPR claimed a much-needed 1-0 triumph away to Reading.
Mile Jedinak was absent as Aston Villa drew 3-3 with Preston North End, while Adam Federici was an unused sub in Stoke's 2-0 win over Bolton.
Kenny Dougall, Ryan McGowan and Cam Burgess played full games in League One, while Bradden Inman played 76 minutes for Rochdale.