Online gambling outfit Lottoland has extended its sponsorship of the Manly Sea Eagles for another year in a deal worth close to $500,000 dollars.

Lottoland's three-year $1 million sponsorship of the club, which includes naming rights for Brookvale Oval, was to expire at the end of this season and looked on shaky ground as Lottoland came under sustained attack from competitors and government regulators.

The one-year extension is worth almost $500,000 dollars. Credit:AAP

But Lottoland Australia chief executive Luke Brill said the group exercised its option to extend the contract for another year over the weekend following a favourable decision in the NSW Supreme Court late on Friday that gave the Gibraltar-based company certainty about its future in Australia.

The sponsorship deal, to be announced on Monday, has been expanded to also include Manly coach Des Hasler and branding of his coaching box.