The former Pick 10 in the 2014 AFL Draft has been hampered by injuries during his six-year career, restricting him to just 34 senior appearances.
The 23-year old has not played this year and has been shut down for the season with booked in wrist surgery to fix a wrist issue.
The Cats are reportedly hesitant to offer him more than a one-year contract, while the Lions could offer a multi-year deal.
Ralph told Fox Sports’ AFL Tonight that Cockatoo is still weighing up his future but will more than likely head north during the trade period.
“I can tell you that Nakia Cockatoo is almost certain to join the Brisbane Football Club next year,” he said.
“Nakia went home and had wrist surgery. His partner is about to give birth to their first child and he was not in the calculations for selection this year and as a result he’ll consider his future.
“He’d probably get one year on a base salary at Geelong and could certainly get more security for his family (at Brisbane). Brisbane have always been very keen on him all the way back through that draft period of five or six years ago.
“He’s played two games in three years and so my expectation is as much as he loves Geelong, if he could get security in Brisbane … I think you’ll find he’ll be in Brisbane colours next year.”