An update on Bo Pelini's health was not expected until his regularly scheduled weekly news conference on Monday.
But the 44-year-old Nebraska football coach was back at work Sunday, and a school spokesman said it was "business as usual."
Pelini fell ill in the first half of Saturday's game against Arkansas State. He was taken by ambulance to a Lincoln hospital after halftime for precautionary tests.
He was released from the hospital by Saturday afternoon. He said in a statement after the 42-13 win that "everything checked out just fine" and that he planned to work Sunday.
Nebraska athletic department spokesman Keith Mann said the university wouldn't comment on Pelini's status unless his condition changes.
Pelini may address his health at his weekly press conference Monday.
His statement after the game didn't mention his symptoms. A team doctor checked Pelini's pulse on the sideline during the second quarter.
Defensive coordinator John Papuchis and offensive coordinator Tim Beck shared head coaching duties in Pelini's absence.
Pelini is the fourth Big Ten coach to have a health scare in recent seasons.
Ohio State's Urban Meyer is back on the sideline after taking a one-year hiatus. He left his job at Florida after the 2010 season because of stress. He complained of chest pains, difficulty sleeping and weight loss.
Michigan State's Mark Dantonio was hospitalized because of a mild heart attack hours after he called a fake field goal to beat Notre Dame in 2010. He had surgery to put a stent in a blocked blood vessel leading to the heart and missed two games.
Minnesota's Jerry Kill had a seizure and collapsed on the sidelines late in the Gophers' home opener against New Mexico State last season. It was the third time in his coaching career that Kill had a seizure on game day. He was taken from the stadium by ambulance.
A series of seizures followed the next three weeks, and Kill had his medication adjusted to control them.