ANN ARBOR, Mich. -- Jim Harbaugh returned to Michigan on Saturday. To collect his championship rings and to make good on his promise to add some championship ink.

Before Michigan's spring game, Harbaugh got a "15-0" tattoo under a block M on his right arm, commemorating the Wolverines' undefeated record on the way to the school's national title.

Former Michigan cornerback Mike Sainristil, whose 81-yard interception return in the fourth quarter sealed the Wolverines' championship victory over Washington, posted videos of the Harbaugh tattoo on social media.

"I'm impervious to pain," Harbaugh said while receiving the tattoo, then he joked afterward that he could "see why once you get one [tattoo] you might want to start adding to it."

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Michigan Football (@UMichFootball) April 20, 2024

This offseason, Harbaugh left Michigan to become the head coach of the Los Angeles Chargers. The Wolverines replaced him with offensive coordinator Sherrone Moore.

During Michigan's run through the College Football Playoff, Harbaugh told his players that he would get his first tattoo if they won the national title.

"I'm going to put it on my shoulder," he said then. "I don't know if it's my left or right yet. I'm a right-handed quarterback, I'll probably get it on my right. And then an M too, an M that's maize and blue."

Before the spring game, Michigan also had a banquet to pass out championship rings.

The Wolverines won a third straight Big Ten title and defeated Alabama in the Rose Bowl CFP semifinal before besting the Huskies in the title game.