Captain Michael Ennis looms as the Bulldogs' key injury concern heading into next weekend's NRL Grand Final.

Canterbury captain Michael Ennis missed the second half of his side's fighting 18-12 preliminary final win over Penrith with a foot injury, but has insisted he'll be right to play in next week's grand final against the Rabbitohs.

Ennis spent the entire second half on the sidelines with ice on his left foot, and the ice pack was still in place when he fronted the post-match press conference.

Asked how he was feeling, his coach Des Hasler interjected with an "I can answer that", to the laughs of the gathered journalists.

"Michael's fine. We pulled him off more precaution and he'll do everything in his power to take his place next Sunday."

Ennis concurred with his coach.

"I just caught it under the tackle with about five to go before half-time. I just wanted to get through to half-time to save us an interchange and got there. It was just a bit sore so we said we'll check it out and see how we go. A week's a long time in footy so I'll do everything I can [to be fit]."

Asked if he was in any pain, Ennis threw a sideways glance at his coach and asked "do you want to answer that?" adding it didn't feel too bad.

"I've had the ice on for about 40 minutes so I can't feel it."

If Ennis's injury does rule him out of next weekend's decider he may not be the only star hooker missing, with South Sydney's Issac Luke facing a potential charge from the match review committee.

Hasler was asked his thought on whether on-report Luke would take his place in the grand final after a lifting tackle on Sonny Bill Williams on Friday night.

"It's not my call. I'd think if he is graded then there's the possibility of the carry overs I think, I was reading somewhere today might become a factor but they'll fight it if he is charged, they'll fight it and he's got a fair chance of getting off," Hasler said.

"It just depends how they want to be with the consistency, it's not really our call."