Johnson had played only 107 games above A-ball coming into the season, and it has shown defensively. His -8 defensive runs saved is currently the AL low and is second only to Will Myers -9 for the major league "lead." In case you were wondering, UZR doesn't like him much either, and he's in the bottom 10 there as well. (Adam Eaton, unfortunately, is second from the bottom in UZR.)
Offensively, it's been a struggle too. He's .270/.333/.297 with a wRC+ of 79. He's also 3-for-5 in stolen bases, which is a bit disappointing considering his speed.
The Sox haven't announced who will replace Johnson yet, but the only move that makes sense is calling up Carlos Sanchez. Sanchez has been tearing up Charlotte in his fourth partial season there. He's been hitting .344/.368/.466 since his return to Triple-A in April.
Update: Hahn says it's Sanchez.
White Sox GM Rick Hahn on Micah Johnson going back to AAA Charlotte: "Temporary setback." Carlos Sanchez coming up— Scot Gregor (@scotgregor) May 14, 2015
Rick Hahn expects Beckham and Bonifacio roles will remain the same as they are now, and Sanchez will play second most of the time.— Colleen Kane (@ChiTribKane) May 14, 2015