Jorge Soler is not in the Cub's lineup against the White Sox tonight. Chris Denorfia will start in right field and bat 7th.
It's just a day of rest for Soler. Jeff Samardzija will be starting for the White Sox, and has a 4.62 ERA on the year, though his FIP is a fair bit lower at 3.83. Denorifa is hitting .298 with a .312 wOBA against right-handers this season.
Source: Baseball Press