Socceroos coach Graham Arnold says Daniel Arzani must consider his future if he's unable to break into Celtic's first team before the January transfer window.
The 20-year-old has managed just 23 minutes of first-team action at the Scottish giants since joining them on a two-year loan in August 2018.
Back playing after recovering from an ACL injury suffered on his Celtic debut, Arnold says regular senior football is crucial if Arzani is to force his way back into the Socceroos set-up.
"Rene Meulensteen, my assistant, went up to Celtic and sat with (Celtic coach) Neil Lennon and they rate him highly," Arnold told Fox Sports.
"They love him. They think that he is a special player but at the end of the day it's all about getting those opportunities on the pitch and getting game time and I think that will come to the forefront over the next six months.
"It's an important six months for Daniel before potentially the January transfer window that he gets game time.
"Celtic obviously are a strong club and have got a lot of depth. Daniel is under no illusions that he has to work extremely hard to get in that side."
While Arzani was not considered for Australia's upcoming World Cup qualifiers against Nepal and Taiwan, the ex-Melbourne City star will be on national team duties during the FIFA window.
Arzani has been named in the Olyroos squad to face Qatar as Australia's under-23s continue their preparations for January's Olympic qualifiers in Thailand.
Arnold will take over the reins of the under-23s for that tournament as Australia attempt to qualify for an Olympics for the first time since 2008.
As to whether Arzani is in his squad, only time will tell.
"He's in great shape. He's happy, he's feeling really good in himself," Arnold said. "His body's feeling great and they'll be stepping it up at Celtic in that side of it.
"He's going away with the Olyroos and he'll get some game time there."