ESPN personality Mike Greenberg has been off the air this week, and now we now why.

The host of the network’s weekday morning show Get Up underwent a heart procedure earlier this week, according to his wife, Stacy.

“For those asking: Greeny had a cardiac ablation on Monday. Recovery is slow, he has to do nothing and believe me….he’s not great at that! We both really, really appreciate all the nice messages.”

A cardiac ablation is a procedure to treat an irregular heartbeat. It’s typically performed by running catheters through veins and arteries, but occasionally is performed during surgery, according to the Mayo Clinic.

Greenberg, who also hosts ESPN’s NBA Countdown pregame show, has been relatively quiet on social media since the procedure. However, he did post to Twitter on Tuesday to mourn the death of Knicks great Willis Reed.