Ryan Dempster's status for Sunday's game is in doubt after the 34-year-old right-hander received an MRI on his right quad Friday. The results are not known at this time.
Randy Wells will be available to start in Dempster's place if it comes to that.
Wells, 29, made 82 starts for the Cubs from 2009-11 with a 4.05 ERA and 1.36 WHIP. He lost out in the rotation battle in the spring and was subsequently sent down to Triple-A, where he has made three starts and sports a 9.42 ERA and 1.54 WHIP in 14.1 innings.