To’o will be forced to undergo surgery, but is hopeful of being back for week one of the finals.
The blows couldn’t come at a worse time for the Panthers, who face the Storm on Saturday, with Isaah Yeo (concussion) and Nathan Cleary (shoulder) not expected to play.
Api Koroisau is suspended and James Fisher-Harris has returned to Sydney to be with his partner prior to the arrival of their child.
Unlucky Rooster Billy Smith will miss the rest of the season after suffering a lisfranc injury to his foot during his side’s win over the Knights last weekend.