Pedro Strop, Steve Cishek and Brandon Kintzler are all unrestricted free agents, and the Chicago Cubs possess a number of options on the likes of Brandon Morrow, Derek Holland, Tony Barnette and Kendall Graveman, amongst others.
Given the volatile nature of relievers and bullpen units, it is safe to say that Theo Epstein seems quite likely to shake things up this winter.
Guys like Rowan Wick, Brad Wieck and Duane Underwood Jr. showed that they could be major contributors at the big-league level, and of course Craig Kimbrel will return as the team’s closer.