The New England Patriots have reached a tentative agreement to sell the NFL team, Sullivan Stadium and the adjoining Foxboro Raceway for $91 million, the Boston Globe reported yesterday.

But both Robert K. Kraft, said to be the buyer, and Patriots General Manager Patrick Sullivan denied the agreement reports.

"I'm going to do everything I can do to purchase the team," Kraft said. "But I don't want to do it through the press."

Both the Globe and the Boston Herald, quoting anonymous sources, reported that a tentative agreement had been reached for the sale . . .

Wide receiver John Jefferson was traded by the Green Bay Packers to the Cleveland Browns, one day after ending a holdout and signing a one-year contract with Green Bay.

In return, the Packers received an undisclosed 1987 draft choice from Cleveland and the NFL rights to Tom Robison, a 6-foot-5, 293-pound offensive tackle who is the property of the New Jersey Generals of the U.S. Football League . . .

The Federal Election Commission set back the NFL's plans to form a political action committee that would contribute money to political candidates who support league causes.

In a 5-0 vote, the FEC commissioners declared that the NFL cannot use funds from its treasury to establish the proposed political action committee, tentatively called the NFLPAC.

The FEC did rule that individual teams could set up PACs of their own.