Gold Coast are expecting the worst for Ben King with the Suns fearing their star forward has ruptured the ACL in his right knee.
The 21-year-old was taking part in the Suns' match simulation on Thursday, but fell to the ground during a contest with No.5 draft pick Mac Andrew.
King was quickly supported by coach Stuart Dew and Suns teammates.
But the club believe King has likely suffered the dreaded season-ending injury.
King underwent scans on Thursday afternoon and was hoping for better-than-expected news.
"We'll just have to wait and see but fingers crossed," he told the Nine Network.
"They've (emotions) settled a bit.
"That's just footy. Get injured, that's just part of it."
King is out of contract at the end of the 2022 season, with clubs in Victoria already trying to prise him away from south-east Queensland.
He has kicked 89 goals - 47 of them coming last year - in 53 games since debuting in round nine, 2019.
King is a player the struggling Suns can't afford to lose with the club yet to play finals since entering the AFL in 2011.
Gold Coast finished 16th last season with seven wins.
King's twin brother Max plays for St Kilda while Essendon have also been heavily linked to Ben.
There has been speculation about Ben returning to Victoria ever since he was drafted by Gold Coast back in 2018.
The Suns were unimpressed by a cheeky tweet from St Kilda's social media team on draft night that read: "Ben, if you ever want to come home."