Phillies top prospect Aidan Miller will undergo back surgery after being diagnosed with discogenic pain and facet inflammation in his lumbar spine.

The Phillies made a move on Friday prior to the start of their weekend series against the Los Angeles Dodgers. Utilityman Otto Kemp has been sent back down to Triple-A and a newcomer will be joining the team.

The Phillies clawed out a big win over the Dodgers in the early hours of Sunday morning.