South Sydney have knocked back Damien Cook's request for a release from his contract to instead extend it until the end of 2019.

In an indication Cook is considered the long-term hooker at the Rabbitohs, the club has upgraded and extended his deal to ensure he stay put for three more years, which is a season longer than the contract of NSW rake Robbie Farah.

New deal: Damien Cook has received an extension on his Rabbitohs deal. Credit:Mark Kolbe

The acquisition of Farah, who was released from the final year of his Wests Tigers contract, raised question marks over the future of Cook. The former Dragons and Bulldogs dummy half then received a lucrative offer to join Cronulla next season, where he would be the starting No.9. Fearing he would be stuck behind Farah at Redfern, Cook was hopeful of a release in order to become the long-term replacement for Michael Ennis at the premiers.

However, Souths have assured Cook he is in their future plans and have come to the table with a new deal, which he has accepted.