The Aussie faces another spell on the sidelines after suffering a muscle injury in Monday night's Barclays Under-21 Premier League draw with Bolton.
Toon coach Willie Donachie confirmed to nufcTV: "It's a hamstring injury.
"I don't know how bad but he just doesn't seem to be able to get a run of games going.
"So it's a shame for Curtis. He was just getting back to fitness and hopefully maybe going out on loan somewhere. But now he's injured again and it's put him back again."
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