Phillies general manager Ruben Amaro said about the reliever, "Herndon went to see [Dr. James] Andrews yesterday, consulted with him. And then today, we believe he is going to end up having a Tommy John. It's a very strong possibility. I don't know the minute-to-minute update, whether they felt like they had to do it. It's a pretty big blow to the kid and to us. He would have done [the surgery] today."
Herndon made five appearances this season before moving to the disabled list with right elbow inflammation. He was 0-1 with a 4.70 ERA in 7 2/3 innings. He struck out eight batters and walked just one.