The teams informed the commissioner's office of the trade specifics, a baseball official said, speaking on condition of anonymity because no announcement had been made.

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

The Yankees also had discussed trading Johnson to the San Diego Padres.

Teams are granted a 72-hour window by the commissioner's office to close tentative deals. The window was to begin later Thursday.

"When we have been granted that window, we would be willing to discuss everything with the Diamondbacks," said Alan Nero, who represents Johnson along with Barry Meister. "Once that window is open, we will do our best to work out a deal."

Newsday reported Thursday that Johnson had agreed in principle through "back-channel conversations" to a $10 million contract extension for 2008.

Arizona also might want to rework the slightly more than $44 million it must pay Johnson for 2007-12. Johnson pitched for the Diamondbacks from 1999-2004 and deferred parts of his salaries during those years.

In another move, first baseman Doug Mientkiewicz and the Yankees reached a preliminary agreement on a one-year contract worth about $1.5 million. Mientkiewicz, who spent 2005 with the crosstown Mets, must take a physical for the deal to be finalized.

Vizcaino, a 32-year-old right-hander, was 4-6 last season with 3.58 ERA in 70 games. He has a 25-23 career record with a 4.24 ERA in eight seasons, playing for Oakland, Milwaukee, the Chicago White Sox and Arizona.

Ohlendorf, a 25-year-old who went to Princeton, was 10-8 with a 3.29 ERA at Double-A Tennessee last season and 0-0 with a 1.28 ERA at Tucson.

Gonzalez, a 24-year-old right-handed hitter, batted .290 in 129 games with Tennessee with six homers, 50 RBIs and 20 doubles. He also hit .200 (3-for-15) in four games with Tucson.

Jackson, 24, was 8-11 with a 2.65 ERA in 24 starts at Tennessee.

Johnson was 17-11 with a 5.00 ERA last season, and the 43-year-old left-hander is coming off back surgery on Oct. 26. Although he has gone 34-19 during the regular season in two years with the Yankees, he is 0-1 with a 6.92 ERA in three postseason appearances.

New York's projected rotation includes Chien-Ming Wang, Mike Mussina, Andy Pettitte and Kei Igawa. The Yankees also have oft-injured right-hander Carl Pavano and hope Roger Clemens can be persuaded to follow Pettitte back to New York. Clemens hasn't decided whether to pitch this year. If he does, the 44-year-old right-hander might follow his 2006 schedule and not start his major league season until mid-June.