Perth Glory left back Scott Jamieson's season appears over after he ruptured his achilles tendon in his team's heartbreaking 2-1 loss to Central Coast on Saturday night.
Jamieson landed awkwardly after an aerial challenge midway through the second half and had to be carried from the nib Stadium pitch on a stretcher.
Glory coach Alistair Edwards confirmed post-match that the 25-year-old would have surgery first thing on Sunday morning and all but conceded the Socceroos hopeful was unlikely to play again this season.
"I'm not sure how long it takes for an Achilles rupture, but he will be out for a considerable amount of time," Edwards said.
"I'm one of many who believe that he was pushing for a Socceroos position. He's been very consistent, playing some great football.
"He's been absolutely quality, but he's distraught."
Jamieson's departure came just minutes after Edwards had made his third and final substitution of the night, leaving Glory to play out the match with just 10 men.
Perth had earlier lost marquee signing William Gallas to a calf injury in the first half, but Edwards did not expect the former French international to miss more than one game.
Gallas, 36, made his first start for Glory and almost scored one of the goals of the season before hobbling from the pitch.
"William trained extremely well during the week and I think he was probably erring on the side of caution," Edwards said.
"He felt something and wanted to come off. We got a good 30 minutes for him, but I think with him being the professional that he is, he wanted to make sure he didn't do anything that would be too long standing."
Glory took the lead against the Mariners through young striker Jamie Maclaren after 24 minutes, but that was cancelled out by Michael McGlinchey's long-range goal only 10 minutes later.
But Jamieson's absence was exposed in the final minute of injury time as an unmarked Mitchell Duke volleyed a cross from Josh Rose into the back of the net for the winner.
"To lose in the last second like that is a bit hard to take, but that's football," Edwards said.
"It throws some challenges at us, but we'll be right because there's a lot of positives in the way that we're playing.
"There was a 10-minute spell in the first half where they (Central Coast) got on top, but apart from that it's probably the best we've played."
Brandon O'Neill and Jack Clisby are the leading candidates to replace Jamieson at left back as fellow youngster Josh Risdon is still months away from resuming from a serious knee injury.