Published: Jan 13, 2011 10:52 PM EST
Updated: Jan 14, 2011 5:31 AM EST

DALLAS (AP) — Dallas Mavericks owner Mark Cuban has filed a lawsuit against the United Football League claiming the league has failed to repay $5 million he loaned it last year.

The federal lawsuit says the league missed the initial deadline for repayment in October and another on Dec. 1.

The suit filed on Monday names as defendants league co-founder William Hambrecht and his revocable trust, which guaranteed the loan.

Calls to the league's legal and public relations offices by The Associated Press on Thursday weren't immediately returned.

Cuban declined additional comment when contacted by the AP.

Cuban's loan coincided with an announcement by the league last April that he would be an investor.

The five-team league completed its second season in November.