Maika Sivo has been ruled out for an extended period of time with a knee injury.
The Eels' winger had scans yesterday following Saturday's match against the Cowboys.
He has sustained an ACL rupture in addition to damage to his MCL.
Sivo will undergo surgery and due to the extended rehabilitation period, he is likely to miss the start of the 2022 NRL season.
Meanwhile, Reagan Campbell-Gillard is on track to return from a groin injury during the NRL finals.
Reed Mahoney (shoulder) and Nathaniel Roache (knee) have been sidelined for the remainder of the season.
Update
Maika Sivo - MCL + ACL rupture (Season)
Reed Mahoney – Shoulder (Season)
Nathaniel Roache – Knee bruising (Season)
Reagan Campbell-Gillard – Groin (Finals)