The Phillies have announced that second round pick Andrew Knapp will have Tommy John surgery on his right elbow (as per @jnorris427). The recovery time for a position player is closer to 6 months of recovery which would have him able to throw by mid to late April. I would suspect that Knapp will be spending spring practices working on his receiving and start the year as the Clearwater DH while slowly working back into the catching role.
This certainly is not good news for a top pick as Knapp is far from a finished product behind the plate, but this should only set him back a couple of months on the defensive side and shouldn’t push back his hitting. The risk is that lost time behind the plate puts more questions in his ability to stick there.