Regis Philbin isn’t letting pending hip replacement surgery slow him down. The Who Wants to Be a Millionaire? host will sit in for Meredith Vieira, host of the syndicated version of the game show, during a weeklong guest stint.

The episodes are slated to air from Nov. 30 through Dec. 4 and mark the first time that Philbin will take over the weekday edition of the game show.

On Monday, the 78-year-old revealed plans to take a leave of absence from co-hosting Live with Regis and Kelly to undergo hip replacement surgery in New York.