McCullough is contracted to the Broncos until the end of 2021 but Cook, off contract after next season, has been linked with a move north to join current South Sydney coach Anthony Seibold at Red Hill in 2020.

The Broncos and Queensland hooker was humorously defiant when asked about the situation on Thursday, turning to Hollywood to make his point.

"No it's definitely not (a worry); I've dealt with bigger things in my life than worrying about that," the 28-year-old said.

"I don't know where that's coming from ... as Leonardo DiCaprio said in Wolf of Wall Street, 'I'm not leaving'."

His quip drew plenty of laughter but McCullough will hope he doesn't follow a similar fate to former Wall Street broker Belfort.

The man glorified on-screen by DeCaprio in 2013 famously defied orders to walk away from his business but was later jailed for defrauding more than 1500 investors out of more than $US200 million ($A275m).

Cook's manager Mario Tartak told News Corp this week that four clubs, including Souths, were chasing his client's signature.

The Broncos are reportedly among the interested parties and if successful would create an awkward situation for McCullough, who debuted at Origin level opposite Cook this year.

Cook's pace out of dummy half exposed Queensland but McCullough said he wasn't ruffled by his opposite number's skill set.

"Everyone's different, different styles, different teams," he said.

"Damien's done tremendously well; he's had a lot of adversity over his times, didn't get an easy run to getting a starting spot in the NRL.

"He's had his ups and downs and clubs not wanting him."

McCullough is just happy to be fully fit after a knee reconstruction kept him on the sidelines this time last year.

"It's good to be back out there on day one, running," McCullough said.

"I've dealt with this before.

"It's a blessing in disguise for me; I've turned up in one of the best shapes I have been."

Australian Associated Press