Parramatta fans weren't the only ones cheering the Eels home on Sunday, one savvy punter collected $623,050 after backing them against the Sydney Roosters.

The anonymous punter placed three separate multi-bets totalling $115,000 with TAB Sportsbet, Parramatta's 40-26 victory sealing the third leg.

"I don't know who it is, they just walked into an agency on Friday afternoon," TAB Sportsbet's Glenn Munsie said.

"The punter just needed the Eels to win by nine points or more to seal it."

The major investment was a three-leg multi bet of $80,000 at $6.33 on Brisbane to beat the Bulldogs with a 10.5 points start and Newcastle to beat North Queensland with the Eels needed to complete the coup.

From that bet alone, the happy punter walked away with $506,000.

"It's not a great day at the office," Munsie said.

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