NRL clubs bosses are divided over an attempt by the Rugby League Professionals Association to have allowances for long-serving players increased in return for a salary cap freeze.

The RLPA has indicated it may overlook a rise in the league's $3.25 million salary cap provided the long-serving allowance - for players who have spent 10 years or more at one club - is increased from $100,000 to between $250,000 and $300,000.

Several clubs, including Brisbane, St George Illawarra, Newcastle, Cronulla and Melbourne gave their tentative support to the proposal.

"I think that would be a good idea," Brisbane chief executive Bruno Cullen said.

"I would support that. Where I believe the cap falls down strategically is in the top end and bottom end of loyalty, in keeping someone you want to keep."

Brisbane pair Darren Lockyer and Shane Webcke are both in their 10th years with the Broncos while a handful of players - Michael DeVere, Petero Civoniceva, Shaun Berrigan and Dane Carlaw - are approaching that.

St George Illawarra boss Peter Doust and Melbourne's John Ribot gave in-principle support to the proposal, but both would like the 10-year limit replaced by a sliding scale.

"I have been in favour of an extension in the long-serving player (allowance) in principle," Doust said.

"I believe the fans like to see players play at the club they started with."

"But I think there should be a sliding scale for seven, eight, nine, 10-year players."

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