FAYETTEVILLE, Ark. -- Bobby Petrino's image of perfection has come to a sudden and surprising end at Arkansas.

The Razorbacks coach was put on paid administrative leave on Thursday night less than seven hours after his boss, athletic director Jeff Long, learned Petrino had failed to disclose he had been riding with a female employee half his age when his motorcycle skidded off the road over the weekend.

Petrino said he had been concerned about protecting his family and keeping an "inappropriate relationship from becoming public."

It was a stunning revelation for a highly successful coach who prides himself on complete control and intense privacy in his personal life. Petrino will now wait out his fate while Long conducts a review.

Arkansas coach Bobby Petrino had a 25-year-old female football employee with him during a weekend motorcycle ride that ended with a crash that sent him to the hospital. The woman was not hurt. Beth Hall/US Presswire

"I will fully cooperate with the university throughout this process and my hope is to repair my relationships with my family, my athletic director, the Razorback Nation and remain the head coach of the Razorbacks," he said in a statement issued by the university.

Long announced the decision to put Petrino on leave at a late-night news conference, one that was reminiscent of when the former Atlanta Falcons coach was hired by the Razorbacks on Dec. 11, 2007. Long said he had no timeline in determining Petrino's future with the Razorbacks.

"I'm at the beginning of the review. I don't know what I'm going to find," Long said. "I am disappointed that coach Petrino did not share with me, when he had the opportunity to, the full extent of the accident and who was involved."

Long said he didn't hear about the passenger -- former Arkansas volleyball player and current football program employee Jessica Dorrell, who is 25 -- until the 51-year-old Petrino called him Thursday afternoon, minutes before a police report was released that disclosed her presence at the accident.

Assistant head coach Taver Johnson has been put in charge of the program. Long's investigation could lead, based on conduct clauses in Petrino's contract, to a suspension or firing.

"I hope to have a resolution soon," Long said. "I certainly don't have all the answers here tonight, as we meet. But again, I have an obligation and responsibility to obtain the information and then act appropriately on that information."

Petrino, who is married with four children, didn't mention he had a passenger during a news conference on Tuesday, two days after Sunday's accident, and a school statement that day quoted Petrino's family as saying "no other individuals" were involved. Petrino said then that he had spent Sunday with his wife, Becky, at a lake and was going for an evening ride. His only mention of Dorrell was vague, and without identification.