Four-time premiership winning forward Andrew Gee has ended his 21 year association with the Brisbane Broncos.

Gee advised the Broncos board last week of his intention to resign to pursue a career opportunity outside of football.

Broncos chief executive Bruno Cullen confirmed on Sunday that Gee - the club's sponsorship director - would officially end his employment at the end of June after hopefully renewing major deals with major backers WOW and Toyota.

Gee, who played 279 games and featured in premierships in 1992-93-97 and 1998, had been widely touted as the man most likely to replace Cullen as the club's next CEO.

Cullen said Gee had been offered a "wonderful" commercial career opportunity with development company Oxmar Developments that was simply too good to pass up.

"Andrew has devoted himself to rugby league since leaving school," Cullen told AAP.

"This is too good an opportunity to let pass because it allows him to broaden his knowledge and experience outside the boundaries of football.

"We're very sorry to be losing him because he has given so much to the Broncos on and off the field."

Gee, from Beaudesert, was at the Broncos when the club entered the NRL in 1988 and played his first game in 1989.

He represented Queensland for the first time the following year.

Known as "GG" he was a tough, uncompromising front-rower who former coach Wayne Bennett often relied open to be his rock for Brisbane and Queensland.

He overcame a serious foot injury which put his budding playing career in jeopardy in the early 1990s.

Gee bravely fought his way to the top and when he retired in 2003 had 17 State of Origin games for Queensland and Australian selection in 1991 on his representative resume.

He left Brisbane in 1999, the year after being named the club's player of year, and had a stint with Warrington in the UK where he was joined by another Broncos great Allan Langer.

Brisbane was expected to officially announce Gee's decision to resign on Monday.

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