Munster was sin-binned late in the game for striking Manu's head with his foot as the Roosters claimed their victory over the Storm.

It was the five-eighth's second sin-binning in a horror night for him after he was marched for 10 in the first half for a professional foul as the Tricolours were on the attack.

Munster said he had apologised to Roosters centre Manu immediately after the incident.

"There was no malice in it, I'm really sorry for what happened," he told NRL.com.

"I'm not usually that type of player and I think the pressure and playing the grand final, obviously wanting to win and being a very competitive person (led to the brain snap).I've apologised to Manu about it.

"I didn't really make any contact and I didn't really try to kick him hard at all. It was just a brain explosion and I'm really regretful at the moment. I don't want to be known as that kind of player and I'm very sorry."

"Even though we lost tonight I'm very grateful to be in a third grand final. I would've been a happy man, even though we lost, just making the grand final. But being sent off for the second time for 10, it really is killing me at the moment.

"I don't want to be known like that. I'll go back to the drawing board and sort something out."