New York ? The NFL players union wants major additions to the revenue pool used to determine player salaries, making negotiations to extend the current contract more difficult than in the past.

Gene Upshaw, the union’s executive director, will meet in Detroit this week with owners on the league’s management council. He is expected to outline a proposal that would add revenues to the television and base ticket sales now used to determine player salaries.

“We’re concerned about the growing disparity between the haves and the have-nots,” Upshaw said, a concern voiced in a different context by owners such as Dan Rooney of Pittsburgh, Ralph Wilson of Buffalo and Jim Irsay of Indianapolis. “And we’re concerned that a lot of revenue that should go to players is not being included in the pool.”

The current contract is not due to run out until after the 2007 season, but the NFL and the union traditionally have extended it long before its expiration. They began talks in April on this extension.

Although Upshaw has not been specific, he presumably would like money from luxury suites, stadium naming rights and local endorsements included in the player pool. His proposal might also shift more money from high-revenue teams like Dallas and Washington to those with a much smaller revenue base in helping determine the pool, from which about 65 percent currently is allocated to the players.

Harold Henderson, the NFL’s executive vice president for labor relations, said Tuesday the meeting was designed to bring the owners on the committee up to date on Upshaw’s position.