After signing David Robertson to a two-year contract the Phillies are likely done making major additions to their bullpen. Adding a veteran reliever for the back-end of the bullpen like Robertson takes Philadelphia out of the race for Craig Kimbrel and Cody Allen.
While major additions are unlikely at this point the Phillies still have room to tinker with their bullpen before spring training and opening day.
One player they should consider is Jake Diekman, once a steady arm in their bullpen.
Drafted by the Phillies in the 30th round of the 2007 MLB Draft, Diekman came up in 2012 and put up very good numbers.