ESPN Radio NBA analyst Jack Ramsay told the Miami Herald on Thursday that his broadcasting career is probably over.
Ramsay, a Hall of Fame coach, said he needs to get medical treatment immediately but would not discuss the nature of his condition.
Ramsay, 88, was diagnosed with prostate cancer in 1999 and received treatment for melanomas several years ago.
He was scheduled to announce Friday night's playoff game between the Miami Heat and Chicago Bulls but the imminent treatment will prevent him from working for at least the rest of this year's playoffs.
Chris Mullin will fill in for Ramsay on Friday.