SATURDAY: Slusser reports that the cash considerations going to the Diamondbacks will be "a couple of hundred thousand dollars."

FRIDAY: As was rumored earlier today, the Diamondbacks have acquired pitchers Trevor Cahill and Craig Breslow from the Athletics for minor leaguers Jarrod Parker, Collin Cowgill and Ryan Cook, according to Susan Slusser of the San Francisco Chronicle (Twitter links) and Steve Gilbert of MLB.com (Twitter). The Diamondbacks will also receive cash from Oakland, tweets Nick Piecoro of the Arizona Republic.

The centerpiece of the trade for Arizona is Cahill, a right-handed starter who has logged more than 175 innings in each of his three seasons as a Major Leaguer. The groundballer (53.3% career rate) is under team control at least through 2015 and perhaps through 2017, depending on two club options. He'll join Ian Kennedy and Daniel Hudson at the top of the D'Backs' rotation, with Josh Collmenter and perhaps (or not) Joe Saunders at the back end.

On a conference call with reporters on Friday night, D'Backs GM Kevin Towers said the timing was right to make a move of this nature:

“A lot of it is just the depth that we have in the system. Certainly, Jarrod Parker was a tough piece to give up, but with Trevor Bauer, Tyler Skaggs and Charles Brewer, we feel we’ve got depth in the starting rotation – also, Wade Miley. We see a window here, specifically in the NL West. We’re kind of in a go-for-it mode.”

Clearly, Cahill will be counted on as one of the mainstays of the D'Backs' rotation, but it wasn't long ago he seemed destined to remain in Oakland after inking a multiyear extension in April:

"I defintely thought I’d be with them a bit longer. But their history is, they usually keep guys when they don’t make too much, then trade them off for prospects. I thought I’d be there longer, but I'm glad to be part of a team that’s headed in the right direction."

Breslow, a lefty reliever, kicked around earlier in his career before latching on with the A's the past three seasons. He's posted a career 3.80 FIP, and with no significant lefty/righty splits, Towers said Breslow will likely be used as a swing lefty out of Kirk Gibson's bullpen in 2012. He is eligible for free agency after 2013.

In Parker, Cowgill and Cook, the A's get three prospects who all have far less than a full season of service time. Of them, Parker, a right-handed starter, is regarded by scouts as having the highest ceiling. Now 24, Parker pitched mostly in the minors in 2011 after missing all of 2010 due to Tommy John surgery. He was ranked No. 19 in Keith Law's top 50 minor league prospects in July.

Cowgill is a 25-year-old outfielder who made his Major League debut in 2011 after posting a .383 career on-base percentage in parts of four minor league seasons. Cook was a starter in the minors before being converted to relief work in 2011. He has a "strong arm, chance for a good slider," tweets Kevin Goldstein of Baseball Prospectus.

John Gambadoro of Sports 620 KTAR in Phoenix first tweeted the rumored trade, and Ken Rosenthal of FOXSports.com, Piecoro, Slusser and Gilbert all filled in with details.