Tom Rogic has suffered a recurrence of a groin injury and is not expected to play again this season.
The Celtic midfielder, who has been on loan to Australian side Melbourne Victory since January, had just returned from a two-week absence due to the problem but limped off after just 39 minutes of a league match with Newcastle Jets last weekend.
Victory intend to wait until they have received the results of a scan before commenting on the injury officially but it is understood that Rogic is unlikely to recover before his loan expires next month.
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The injury could affect the midfielder's prospects of playing in the World Cup this summer, with concerns having been raised already during a loan move beset by injuries. Rogic has played just eight times for Victory.