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Rabbitohs centre James Roberts.

South Sydney have been dealt a blow on the eve of their preliminary final against Canberra, with representative star James Roberts ruled out due to the dislocated thumb he suffered against Manly.

Roberts trained away from the rest of the squad on Thursday and did not complete any ballwork or contact work with coach Wayne Bennett confirming the worst soon after.

Bennett said he did not expect Roberts to miss the grand final should the side make it, but could not expect him to get through the Raiders.

"We've managed inconvenience all season so it's no big deal," Bennett said.

"We lost one of the best players in the game (Greg Inglis) before the season even started, or after two games, and from that point on we've had lots of injuries or lots of players missing and we've managed to get the job done and I have no doubt these guys will tomorrow night."

Roberts' omission sees Campbell Graham start in the centres and Corey Allen will come onto the wing.

Raiders v Rabbitohs - Preliminary Finals

Graham showed his versatility last weekend when his defensive work out wide helped blunt Manly's attack as the Rabbitohs prevailed 34-26 to book their ticket to Canberra.

Bennett conceded around a third of his side are carrying injuries into the grand final qualifier.

"Probably 10, those guys are fit enough to play, they've been managing, it's just that time of the year, he said.

"You look at the Raiders and the other clubs, they'd have the same problems, they're manageable and doctors and physios are great. We wouldn't play them if they're not fit enough to play.

"I think this year is the worst year they've had for injuries over the last four years.

"Key players in the club not playing, at times we've played with 40 per cent of our salary cap.

"It's been remarkable to do what they've done, it's a credit to them."

Burgess brothers countdown to last game

After leaking 56 points in the last two weeks, Bennett could be forgiven for having sleepless nights about the threats posed by the likes of Wighton, Leilua, Rapana and Nicoll-Klokstad.

"We've defended well for periods this season, we didn’t defend the week before that, so we’ve had two pretty ordinary weeks of defence," Bennett said.

"But we managed to score enough points to win the game and obviously we go back tomorrow night and try and get our defence right and I'm confident we will.

"Last week were our individuals rather than the system that let us down."

Friday's game takes Bennett back to where it all began in 1987.

"I didn't think I'd last any longer than my contract here," Bennett said of his early days with the Raiders.

"It's a pretty volatile job coaching so I have been very fortunate to be able to do what I have done.

"I worked with Don Furner here and he was wonderful to work with and he was good to me as was the club.

"Les and John McIntyre helped build the job and I have nothing but praise here for what they did for me."

Acknowledgement of Country

Canberra Raiders respect and honour the Traditional Custodians of the land and pay our respects to their Elders past, present and future. We acknowledge the stories, traditions and living cultures of Aboriginal and Torres Strait Islander peoples on the lands we meet, gather and play on.