Callahan was on medical leave from the program from mid-April to August 2007. According to Jason Wolfe, the vice president of programming for Entercom Boston, Callahan underwent a "minor surgical procedure," and worked with a voice therapist. The "Boston Globe" later reported that the surgery was to remove polyps from his throat which had made him hoarse. During Callahan's absence, the co-host responsibilities were covered by several local sports media personalities including Bob Neumeier, Dale Arnold, Steve DeOssie, and Larry Johnson.