Cronulla have re-signed back-rower Anthony Tupou and centre Ricky Leutele for the next two NRL seasons.

The in-form Tupou recently played his 200th NRL game while Leutele has been ruled out of the rest of the season with an ankle injury.

Sharks coach Shane Flanagan welcomed the news as a further boost to his side who have won four of their last five games after a slow start to the season and sit in sixth position on the ladder heading into round 16.

"The last couple of years, while he hasn't missed a lot of games Anthony had that radical surgery and has played injured a lot of the time. But finally his knee is good, he's fit and he can run again," Flanagan said.

"As a result we're seeing the old Anthony Tupou, fit and strong and were very happy he's signed on for another two years.

"With Ricky, it was disappointing about his injury this year but he was in first grade, playing well and showing us what he can do at the start of the year. It's a really important position and he is showing great potential."

Tupou said he turned down a number of offers from rival clubs. The former Kangaroo had been linked to Parramatta and a move to the Super League, to stay with the Sharks.

"I'm just happy now that I know I'm here for another two years and I think it's a really good opportunity for me," Tupou said.

"I feel like the club is getting better and better and I want to be a part of that and really add to that as well."

Halves Todd Carney and Jeff Robson re-signed with the club last month.

Cronulla play North Queensland in Townsville on Sunday.