ESPN has called in Olympic legend Michael Phelps to assist the College GameDay crew with game picks on Saturday in Ann Arbor, Michigan.

Phelps announced on Thursday that he will be the special guest picker for this week's edition of College GameDay.

Phelps attended Michigan as a student and volunteer assistant coach for the swim team. He was unable to compete for the team because of an endorsement deal with Speedo at a time when the NCAA didn't have a name, image and likeness policy.

Bob Bowman, who was Phelps' personal coach, was head coach for the Wolverines' swim team from 2005 to '08.

Former Michigan head coach Jim Harbaugh got Phelps to join a Zoom call and speak with the team before the start of the 2022 season.

"He talked about sleep. He talked about hydration and water," Harbaugh told reporters about Phelps' message to the team. "Somebody that could go anywhere in the world and do any kind of treatment known to mankind ... he uses ice, sleep, and gets hydration with water. ... Our team has an ice bath waiting on them now. They have water, and they're getting that sleep. Those are the kind of things they take care of themselves, and it takes care of the team."

ESPN's flagship college football show is setting up camp in Ann Arbor this weekend for the huge showdown between No. 3 Texas and No. 10 Michigan at the Big House.

Phelps will be the third guest picker to appear on College Gameday this season. WWE superstar Sheamus joined the show in Ireland before the Florida State-Georgia Tech game. Former Heisman Trophy winner Johnny Manziel was at College Station last week for the Notre Dame-Texas A&M showdown.

Guest pickers are 1-1 so far this season in picking games at the host site. Sheamus correctly had Georgia Tech beating then-No. 10 Florida State in what seemed like an upset at the time.

Manziel had to go with the homer pick as one of the most famous Aggies players of all time, but they came up short 23-13 against Notre Dame.