Dolphins host Raiders, needing a win and Roosters' loss for a chance at finals berth.
The Dolphins could be playing for a place in the top-eight when they host the Raiders on Sunday afternoon.
Kristian Woolf's men enter Round 27 two points behind the eighth-placed Roosters and need the Sydney club to fall to bitter rivals South Sydney on Friday night.
Should that occur, the Dolphins will need to win and reverse a 15-point for and against difference to book their maiden finals berth.