Canberra forward Tom Learoyd-Lahrs admits his NRL season is likely to be over after a sustaining a suspected torn bicep tendon in Monday's win over the Sydney Roosters.

The Raiders ran out 38-12 winners at the Sydney Football Stadium, but the NSW and Australia star failed to finish the game after sustaining the injury in the second half.

"I just came out to make a tackle on one of the boys there and I sort of missed him with my shoulder and stuck my arm out and hit him with my forearm and hyperextended my elbow," Learoyd-Lahrs said.

"I think that just tore the tendon on the bicep, so it's not looking good."

Learoyd-Lahrs has battled a series of injuries this season before returning to action last month, which cost him a likely spot in the NSW State of Origin team, and although he is hoping for the best, he is fearing the worst.

"Hopefully it's not that (torn tendon) but that said, more than likely that's what it is," he said.

"I'll just keep my fingers crossed but there's not much chance of it being (good news), because if it is torn I'm definitely gone.

"I've been highly motivated the last couple of weeks, the last month I've probably been as motivated as I've ever been and really enjoying my football.

"So this is a real blow, I'm pretty disappointed at the moment and I suppose it'll be worse tomorrow morning when I wake up and it sinks in.

"If I do get the news that it is season-ending, I probably won't be the nicest person in the world to be around."

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