Nebraska coach Bo Pelini wrote a letter of apology for disparaging comments he made in private about fans two years ago that surfaced earlier this week.
The letter was published on the school's website.
Deadspin.com obtained audio of Pelini's comments, which included using profane language about fans and newspaper reporters, and posted them on its website on Monday.
Pelini issued an apology after his comments surfaced and had his letter posted Friday.
"This past week has obviously been a difficult one for many people associated with the University of Nebraska and our football program," the letter stated. "I wanted to take this opportunity to say I regret the comments that I made in private two years ago, and apologize to Husker fans everywhere.
"We all make mistakes in our lives, both personally and professionally, and like everyone else I am human. The important thing is to learn from your mistakes and correct them to improve yourself as a person. I hope you can see that I have done that and continue to strive to improve each day.
"Most importantly, I want all of you to know that my comments in 2011 were not in any way representative of my true feelings about our great fans and donors here at Nebraska. The time, energy, money and passion you invest in our football program and all of our athletic programs is second to none."
The Deadspin.com audio caught Pelini speaking off air with Husker Sports Network play-by-play announcer Greg Sharpe before his postgame radio interview following Nebraska's win over Ohio State in October 2011.
Pelini was criticized by fans and media the week leading up to the game because of a 31-point loss at Wisconsin.
In the audio, Pelini uses an expletive several times in reference to "fair-weather" fans.
Nebraska chancellor Harvey Perlman and athletics director Shawn Eichorst said Wednesday they would not discipline Pelini.