Buster Olney of ESPN reports that the Diamondbacks are interested in Mike Olt, and that he would be an integral part if they were to deal Justin Upton to the Rangers.
The Diamondbacks seem increasingly likely to deal Upton in the coming weeks, and the Rangers have no spot for Olt after their signing of Lance Berkman. There will surely have to be other pieces involved on the Rangers end, perhaps Martin Perez, to make the deal work, but this seems feasible on both ends.