SAM Thaiday has signed a new three-year deal with the Broncos and set his sights on becoming the third member of the prestigious Broncos' 300 Club.

Under the new contract inked today, Thaiday will be a Bronco at least until the end of the 2018 NRL season.

The news comes as the Broncos prepare to play a Qualifying Final in front of a packed Suncorp Stadium on Saturday night against fierce rivals the North Queensland Cowboys.

While Thaiday's contract has taken some time to be finalised, the Test and Origin star said it was always a 'done deal'.

"It is always a hard decision and I've got a few new factors in my life now - I have a young family," said the father of two girls.

"In my heart I always wanted to stay at the Broncos.

"This has been an ongoing conversation my management and the club has been having all year knowing my contract was finishing.

"We just had to iron out a few things so I could stay.

"This is where I have made my home. I came down as a kid after graduating from high school in November 2002.

"I couldn't see myself going anywhere else, it was always a done deal.

"I'm happy to be here, and happy to be here for life."

Thaiday would not close the book on this being his last contract with the Broncos.

He will be 33 years old when this new deal expires.

He has the goal of joining Darren Lockyer and Corey Parker as the only Broncos to play 300 NRL matches.

Thaiday also had a special message for Broncos' members.

"I think I will assess again after the three years is done and see how the body is going," he said.

"There might be some milestones I would like to reach - the 300 Club would be fantastic to be a part of.

"Hopefully in those three years we can do some fantastic things so come with me - especially those members."

Broncos chief executive Paul White said Thaiday's signature was a milestone in itself for the Broncos.

"We are very pleased to be announcing his new contract tonight," said White.

"Sam has been with us since he was a teenager and grown into a wonderful player and man in his time at the Broncos.

"This also helps cap a special week as the club sets to host its first NRL Final in four years."