(CNN) Ryan Seacrest is passing his "American Idol" mic to radio host and author Bobby Bones.

But, just for one night.

The longtime host of the hit singing competition show is out sick on Monday's episode, and Bones is scheduled to fill in.

"Welcome to 'American Idol.' Now, I am not Ryan Seacrest; I am Bobby Bones," Bones says in a preview of the episode. "Sadly, Ryan is sick, and I look most like him so they asked me to fill his shoes tonight. Ryan, love you, buddy. Hope you get better."

It's unclear what Seacrest was sick with at the time, but the episode was taped a few weeks ago.

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