The Cubs’ acquisition Monday of left-hander Drew Pomeranz from the Mariners was the beginning of what’s expected to be the in-season approach to fortifying the bullpen.

The Chicago Cubs made a series of roster moves Wednesday, adding Drew Pomeranz to their roster and designating Gage Workman for assignment.

When the bullpen became a trouble area early on last season, the Cubs made a series of in-season moves that helped stabilize the group. The front office is once again keeping an active eye on which ar