Kentucky Wildcat fans run riot
Kentucky Wildcats fallout continues after defeat to Wisconsin Badgers USA TODAY Sports

The fallout over the end of Kentucky Wildcats' undefeated streak continues after one of their player was forced to apologise after using a racial slur.

Andrew Harrison, one of the Wildcats' star players, was overheard muttering "F*** that n*****" when asked about an opposing player during the post-game press conference.

Warning: This video contains racist comments and offensive language

Harrison later apologised on Twitter claiming that he had used the words in jest and said that he had apologised to Frank Kaminsky, the Wisconsin Badgers player who he had directed the slur against.

Harrison was attending the press conference after the Wisconsin Badgers defeated the Kentucky Wildcats 71-64 on Saturday night in a thriller that came down to the final minutes.

The defeat meant that the Wildcats' undefeated streak came to a shuddering halt at the hands of Wisconsin in the NCAA tournament.

The Wildcats were on course to become the first college basketball team in 40 years to go undefeated in a season.

Fan fires

Following the game last night, police arrested 31 Kentucky Wildcats fans after they reportedly set fires in Lexington near the University of Kentucky's Lexington Campus, according to the police.

A Lexington Police Department spokeswoman confirmed a number of people were injured and were taken to a local hospital for treatment, but none of the injuries were serious.

Fans gathered on State Street and set fire to "multiple objects" and reports on social media showed a large crowd gathering around an unidentifiable object in flames.

Meanwhile, celebrations in Madison, Wisconsin were largely peaceful with the Madison Police Department even posting a photo of the huge public gathering and joking in a Tweet: "Unofficial crowd estimate: more than 12."

The Wildcats close the season at 38-1 – two wins short of becoming the first undefeated team in college basketball since the 1975-76 Indiana Hoosiers.

They were leading by four points with six minutes left in the game, the Badgers scored eight points without reply to become the first team to beat the Wildcats this season.

Wisconsin will now play Duke for the national championship after they won their semi-final against Michigan State 81-61.

"They did to us what we've been doing to other teams all season," Wildcat's coach John Calipari said.

"They executed down the stretch and we didn't."