Felix Doubront allowed just two runs over five innings but the Cubs fell to the Pirates on Saturday.
Felix Doubront fired seven innings of one-run ball Saturday as the Cubs won the first game of a doubleheader against the Cardinals.
Cubs activated LHP Felix Doubront from the 15-day disabled list.
The Cubs plan to use a six-man rotation in the month of September, with Felix Doubront remaining after his spot start on Saturday.
Felix Doubront (calf) allowed three runs over six innings Sunday in a rehab start at Triple-A Iowa.
Felix Doubront (calf) will begin a minor league rehab assignment Tuesday with Triple-A Iowa.
Felix Doubront (calf) threw a bullpen session on Sunday.
Cubs placed LHP Felix Doubront on the 15-day disabled list with a calf strain.
Cubs acquired LHP Felix Doubront from the Cubs for a player to be named later or cash considerations.
FOX Sports' Jon Morosi reports that the Cubs have an agreement in place to acquire Felix Doubront from the Red Sox for a player to be named later.
Mopping up after Clay Buchholz was pulled, Felix Doubront gave up six runs while getting just two outs in the sixth inning Monday against the Red Sox.
Felix Doubront said Sunday that he'd rather be traded if he's not going to start for the Red Sox.
Felix Doubront will not start next week versus the Cubs as previously expected.
The Red Sox have moved Felix Doubront to the bullpen.