Shaun Johnson.
Johnson limped out of team training this morning after the injury which ruled him out of last Sunday's match against Manly flared up once again.
Coach Andrew McFadden said Johnson was unlikely to play again until the injury has healed.
Veteran Thomas Leuluai is expected to again fill the No 7 role against the Raiders, while 19-year-old rookie Tuimoala Lolohea will again provide cover from the bench.
"It looks unlikely at this stage that he will take his place. We definitely won't risk him if he's not 100 percent," McFadden said.
"He's too important to us long term and he's the type of athlete that needs to be 100 percent. He's built on speed and power and if he's not it will affect his performance."
