The Arizona Republic reports that the Randy Johnson contract extension is as good as done:

The Diamondbacks will reach an agreement with pitcher Randy Johnson by today's 3 p.m. (Arizona time) window that completes a trade with the New York Yankees to re-acquire the future Hall of Fame left-hander, The Arizona Republic has learned.

The deal won't become official until Monday after Johnson, 43, completes and passes a full physical in the Valley. But there is strong reason to believe that won't be an issue and that Johnson will then by introduced during a news conference on Tuesday at Chase Field.

Johnson and his representatives agreed to a contract extension for the 2008 season, which could pay him anywhere from $10 to $14 million or more. The Yankees will pick up $2 million of his $16 million salary for this season, and some of that base pay may be deferred into next year's contract.

So far, so good. I assume, even without a physical, that the Diamondbacks believe Johnson is healthy.

Update: It's been confirmed by Josh Byrnes that a deal is in place. Now, just the physical can stop the deal. It also looks like a good chunk of Johnson's 2007 salary will come in a bonus payable over four years.