In the middle of today's doubleheader, the Yankees optioned left-handed outfielder Brennan Boesch to Triple-A Scranton. Considering all the right-handed starters the Yankees will see against the Mariners, the Yankees will want as many left-handed bats as possible. There was some speculation that this could mean that Curtis Granderson will return.
After the second game, Joe Girardi indicated that the Yankees were considering calling up Granderson depending on how he felt following tonight's game. According to Donnie Collins, the outfielder gave the Yankees the thumbs up a few minutes ago and could be playing as soon as tomorrow. So it's unofficial at the moment, but I'd imagine that Granderson's word is as good as anyone's