Pat Haden is apparently back to his "regular self" after suffering from an unspecified health scare on the sideline during USC's game against Notre Dame.

According to The Los Angeles Times, Haden suddenly dropped to a knee from feeling lightheaded and required medical attention. In USC's first game since Steve Sarkisian's termination, the Trojans lost 41-31 to Notre Dame in South Bend.

Before eventually flying back to Los Angeles on a private flight, Haden reportedly left stopped at a local hospital. He posted to his Twitter account Sunday that he "checked out fine."

Thanks for all the support. I checked out fine and am feeling great today! Proud of our effort vs ND, came up just short. Beat the Utes!

— Pat Haden (@ADHadenUSC) October 18, 2015

Clay Helton, USC's interim head football coach, told reporters on a teleconference that Haden appeared fine and was back to work Monday, The Times noted.

"And then while we were watching tape with the offensive staff, he came in extremely chipper, gave his full support [and] looked like his regular self," Helton said.

At 3-3 overall and 1-2 in the Pac-12, the conference championship game might well be out of reach for USC. They trail Arizona and Arizona State by half a game and are tied with UCLA, though the Bruins are a game better overall. Visiting USC this weekend, Utah is undefeated, ranked third in the nation, and leading the way in the Pac-12 South.

Haden had a similar undisclosed health scare in Aug. 2014 in which he was briefly hospitalized and apparently returned to work soon after. The 62-year-old athletic director at USC has a pacemaker, but it is unclear if it is related to the incidents.

Haden also told ESPN earlier this year he was "not sure" of his affiliation with the College Football Playoff committee beyond this season.

"My health is good," he said at the time. "I had some issues. We're working through them, and I feel pretty good."