South Sydney forwards Eddy Pettybourne and Jason Clark have signed new two-year contracts with the NRL club.

Pettybourne, 22, and 20-year-old Clark, who have both come through the club's junior ranks, put pen to paper on their new deals on Sunday.

"I'm really happy to be extending my contract here for two more seasons," said Pettybourne, who was called up for the New Zealand squad for the first time for last year's Four Nations tournament in Europe.

"I really enjoy playing with this group of players and I'm looking forward to improving as a player over the next few years at Souths."

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