Earlier today we learned that the Diamondbacks have interest in free agent second baseman Kelly Johnson , and now we're able to add three more clubs to the list of suitors. MLBTR learned from an industry source that the Pirates, Cardinals, and Astros have interest in Johnson. - Tim Dierkes, MLBTR
MLBTR isn't 100% reliable, but the possibility is interesting enough that I think it's worth discussing anyway.
Johnson would've been easier to fit onto the roster before the Iwamura pickup, but even now, he'd be a smart addition at the right price. He's a career .264/.346/.430 hitter who can play second, third, or corner outfield, and he'd immediately become the best player on our bench. Even better, as a 28-year-old, he's young enough that he could plausibly be a future building block if he acquits himself well in 2010. He struggled in 2009, but the main source of those struggles appears to have been a large drop in his BABIP relative to career norms (.313 career, .249 in 2009), making him a likely bet to rebound. His 2010 CHONE forecast is a .262/.338/.428 line.
If Johnson were to sign, the players most likely to be threatened by his presence on the roster would seem to be Vazquez and Young. I could certainly live with an upgrade on either of those two.