Wests Tigers NRL finals chances have received a shot in the arm with Benji Marshall revealing he was confident of playing in Friday night's sudden death semi-final against Canberra.

Marshall suffered a bruised medial ligament in his right knee in Saturday night's dramatic 19-15 golden point loss to the Sydney Roosters.

The injury forced him from the field and left the Tigers with only 12 men for the final five minutes against the Roosters, with coach Tim Sheens having used up all his interchanges ahead of the extra time period.

Scans taken after the match showed the medial was still intact, Marshall vowing to do all he could to get back on the field to face the Raiders.

"There is a premiership at stake and I will do everything I can," Marshall said in a statement released by the club on Monday.

"If it hurts I am going to have to go through a bit of pain.

"I will know more tomorrow or Wednesday but going on the last couple of days, it looks promising.

"I am sure the coach will give me every opportunity to game day. Even if I can't train this week, he has got enough faith in me to know that I will still be able to do the job.

"If I think I will be right game day, I will play."

The loss of Marshall would be a devastating blow for the Tigers, who already face a mountain to climb mentally as they look to get themselves up for another game after coming up just short in their 100-minute epic.

"I feel alright. I've had a few sleepless nights just trying to ice up and do everything I can to be right," Marshall said.

"I am reasonably confident and it is just a matter of how much work I put into it is what I am going to get out of it. It is all about recovery at the moment."

Backrower Gareth Ellis said after the game he was confident his back injury would not keep him off the paddock against the Raiders, but Geoff Daniela is certain to miss the game with a hamstring tear.

Mitch Brown is likely to slot into the centres for Daniela with Wade McKinnon hopeful of returning from a hamstring strain at fullback.

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