Roosters coach Trent Robinson says his side are hurt and embarrassed after recording the club's biggest ever loss against their old rivals in 112 years of the competition.
However, Robinson also felt the team's self-belief would recover quickly, noting they did not become bad players overnight.
"It hurts a lot. Very embarrassing for us," Robinson said of the 60-8 defeat.
"There's not much more to say than that really. To go out and perform like that is really disappointing. You can't feel much worse."
Robinson took responsibility for the loss rather than criticise any of his players.
"In the end it's my job to get the guys prepared and ready to play and perform well," he said.
"We just didn't do that. We've got to take our medicine. It really hurts.
Match Highlights: Rabbitohs v Roosters
"It's not about looking elsewhere, it's about saying 'we didn't represent it well enough, I didn't represent it well enough tonight and we have to make sure we sit in it for a while, deal with it and by Sunday morning when we wake up we get that belief and get back to playing footy.
"We didn't become poor footy players overnight. We got huge lessons there so take them on board, get back to our footy ASAP.
Friday night's thrashing could drop the team to a fourth place finish and threatens to take a toll on their confidence on the eve of the finals.
It could come at a physical cost too with hooker and co-captain Jake Friend requiring scans on a possible facial fracture after an early head clash that force him off after just three minutes.
'Embarrassed' Robinson reflects on shock loss
"He's OK. He's got to get it checked, we'll see how that is. He's sore. I can't give you much more than that," Robinson said.
The Roosters won last year's premiership with rookie Sam Verrills at dummy-half with Friend out injured and was prepared to do it again despite both those players being absent.
"It's obviously a specialist position and you want to have those craftsmen playing there that have played some games but we've been here before as well," Robinson added.
"We'll see how Jake is, then the possibility of someone to fill that role and fill it well."