New York ? The Yankees and Arizona reached a tentative agreement Thursday on a trade that would send Randy Johnson to Arizona, a move that allows the Big Unit’s agents to get him a contract extension. The teams informed the commissioner’s office of the specifics of the trade, a baseball official said, speaking on condition of anonymity because no announcement had been made.

Arizona would send pitcher Luis Vizcaino to the Yankees along with minor-league pitcher Ross Ohlendorf and shortstop Alberto Gonzalez, another baseball official said, also on condition of anonymity. The Yankees also might receive another minor-league pitcher, the official said, and would pay between $1.5 million and $2 million of Johnson’s $16 million salary this year.

Teams are granted a 72-hour window by the commissioner’s office to close tentative deals, but it was not clear when that time would begin.