Cubs' Alec Mills: Undergoes surgery

Mills underwent a procedure to remove part of a disc in his back Wednesday, Sahadev Sharma of The Athletic reports.

Mills has been dealing with a lower-back strain since early July and was transferred to the 60-day injured list in late August. The right-hander's procedure was successful, but it seems likely that he'll be held out for the remainder of the season, especially since the Cubs aren't in postseason contention.