Sydney ruckman Kurt Tippett is facing an extended period on the sidelines after suffering a hamstring tendon injury during the Swans' 42-point loss to the Giants at Spotless Stadium on Sunday night.

Tippet had enjoyed an impressive start to the game, before injuring himself during a ruck contest in the second quarter, forcing him off the ground for the remainder of the match.

Coach John Longmire said post-match that without knowing just how bad it is just yet, the club expects it is a "significant" injury.

"It's a hamstring behind the knee, so I think it's going to be a significant one," he said.

"We don't know (the extent of the injury); (but) that's as much as we know at the moment.

"We haven't got him scanned yet so we won't know until tomorrow (Monday)."

Meanwhile, Gary Rohan suffered a hamstring injury in the second half and did not return to the field, while while youngsters Callum Mills (throat) and Isaac Heeney (shoulder) copped knocks during the match and will be assessed during the week.

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