Fri 8/29/14 11:48 PM

Doubront (calf) has been activated from the disabled list to start Saturday, Gordon Wittenmyer of the Chicago Sun-Times reports. Zach Rosscup was optioned to Triple-A (and subsequently recalled as the 26th man for Saturday's doubleheader) to clear space on the roster, while the Cubs are apparently going to use a six-man rotation to get a look at Doubront as a starter in September.