Zimmerman does not know his prognosis, but says he has a new level of discomfort since having arthroscopic surgery to repair the AC joint in his right shoulder in October of 2012.
Zimmerman on shoulder: It's been a tough two and a half years →
"It's been a tough two-and-a-half years, or however long it has been. But what can you do? You just have to keep working and trying to get through it," he said.