Marshall lasted just 18 minutes in what could be his last ever NRL match, before being hit high by Will Smith and taken off the field for an HIA.

But while the head check was compulsory, his left knee was always the bigger issue and Tigers officials duly confirmed medial ligament damage and ruled out any return.

Marshall's injury overshadowed a thrilling finish, as Parramatta scored two tries in the last 15 minutes before Clint Gutherson pulled off a crucial try-saver on Luke Garner with three minutes to play.

The win secured third spot and a second chance come finals, as a date with Melbourne awaits in Brisbane next Saturday.

The result also means the Sydney Roosters will face minor premiers Penrith in the other qualifying final, and consigns Canberra to a sudden-death clash with Cronulla.

South Sydney and Newcastle will play in the other elimination final.

Regardless of the result, the Eels' form remains a concern.

Their defence was leaky as they conceded five tries against the Tigers while Ryan Matterson could find himself in trouble for a crusher tackle.

They could also still be without injured five-eighth Dylan Brown next week, and found themselves down by eight in the second half after leading 16-8 at the break.

"We certainly can't have a patch of footy like we did tonight (against Melbourne)," coach Brad Arthur said.

"They had 12 sets to two to start the second half. You can't do that.

'"We just need to arrest the momentum. Defend one set. Get the ball back. Complete."

Junior Paulo was the man to save the Eels, laying on an offload for Reed Mahoney to go over on 66 minutes after he had also been instrumental in their first-half surge.

Will Smith then scored the go-ahead try filling in at five-eighth with seven minutes to play, making his case to wear the No.6 jersey against Melbourne next week.

The comeback came after the 35-year-old Marshall's injuries marked a sad end to his 257th and final game for the Tigers, with no contract yet secured anywhere for next year.

The five-eighth had looked dangerous on the left before his injury, helping David Nofoaluma put Tommy Talau over for the Tigers' first with a cut-out ball.

He was taking the ball to the line again and passing when he was hurt in the Smith tackle.

"It was disappointing obviously," coach Michael Maguire said.

"Everyone is aware of what Benji has been able to do in the game. It's not just on the field at times, but everything around the game.

"He will be a legend of the club, and holds a very big legacy in the game."

The fan favourite finishes level with fellow retiree Chris Lawrence as the Tigers' all-time leading try-scorer with 84.

But while Marshall was sidelined, Adam Doueihi starred in his audition to wear the No.6 jersey next year if Josh Addo-Carr takes his fullback role.

Doueihi kickstarted the Tigers' second-half run when he laid on a bullet cut-out ball for Tommy Talau.

He then forced another try with a towering torpedo bomb that was fumbled by Blake Ferguson, with Asu Kepaoa there to capitalise.

But the Tigers' defence again let them down late, as they became the first team in premiership history to concede 26 points or more for 10 straight games.

Australian Associated Press