Melbourne Storm star Cameron Munster admits his side were "rattled" by the Parramatta Eels during their qualifying final and he won't be shocked if the Eels make the grand final.

The 22-year-old Storm five-eighth, who turns 23 on Wednesday, gave a raw account of the first half of Saturday's game and he believes the side strayed from their game plan.

"The Eels had really good line speed in the game and they D'd up [defended] on us in our red zone," Munster said.

"We went away from our game plan and we usually don't go away from our plan. We weren't composed in the last 20 minutes of that first half and then we got back to what we do best by running hard and tackling hard in that first part of the second half.