Johnson going back to Arizona?

The D-backs and Yankees have agreed on a deal that would send Randy Johnson back to Arizona.
The D-backs are likely to be granted a 72-hour window today to begin negotiations with Johnson on an extension that would keep him in Arizona through the 2008 season because he has expressed a desire to pitch closer to his Phoenix-area home, and indications are that the two sides would be able to reach an agreement on an extension.
Once that happens, Johnson, who underwent surgery to repair a herniated disc in his back following the 2006 season, would have to undergo a physical and the D-backs would review his medical file.
The D-backs will send veteran reliever Luis Vizcaino and a pitching prospect in exchange for Johnson. It's believed that the Yankees will include some money in the deal to help Arizona defray the cost of Johnson's $16 million salary for 2007.
The D-backs would rather part with Vizcaino than young reliever Brandon Medders because the 32-year-old Vizcaino is set for a raise from the $1.7 million he made last year and he is one year away from becoming a free agent.
The Yankees, who have not commented on the potential deal, are willing to trade Johnson because they have a surplus of starting pitchers and would like to continue to restock their farm system with pitching prospects.
Johnson was originally dealt to the Yankees from the D-backs after the 2004 season. In two years with the Yankees, he is 34-19 with a 4.37 ERA.