SNY broadcasting analyst Ron Darling announced that he will be taking a temporary medical leave following Saturday's Mets game against the Braves.
Doctors have been monitoring Darling over the last few months and tests revealed a mass on his chest.
Darling is scheduled for a medical procedure next week. The doctors have told him that if there are no complications he should be back in the booth alongside Gary Cohen and Keith Hernandez next month.
"My health is the top priority right now for my family and I," Darling said. "I'm looking forward to being back in the booth with our crew and my friends, Gary and Keith, as soon as I can."
Cohen added: "I will miss having Ron to my right in the booth in the coming weeks - but I am glad he is putting his health first. Everyone is hoping for a successful outcome and a quick recovery so we can get back to calling the game we love together."
Fred and Jeff Wilpon said their "thoughts and prayers continuously remain with Ron for a full recovery," adding that they "look forward to seeing him back in the broadcast booth soon."
SNY studio analyst and former New York Met Todd Zeile will fill in for Darling during his medical leave.