The left-hander was struggling (8.18 ERA) before the back strain and could be a tough fit back into the rotation if others are pitching well.
The Cubs have a hole in their rotation and could plug it with either Mike Montgomery or Class AAA starter Eddie Butler.
Brett Anderson gave up five runs in one-third of an inning as the Cubs lost 11-6 to the Yankees on Saturday night.
Anderson’s six innings gave the Cubs their first quality start in eight days, significant if only for the importance of the rotation to this season.
Joe Maddon acknowledged the near impossibility that Anderson — a career starter with a complex health-related prep regimen — could open in bullpen.
Joe Maddon said catcher Montero’s improved look this spring won’t mean more playing time for the two-time All-Star. Willson Contreras is the starter.
Joe Maddon hopes to keep Brett Anderson healthy enough to pitch at least 160 innings this season, which he believes will mean “significant numbers.”