BLOOMINGTON, Ind. -- Indiana University's athletic director on Wednesday said he was "profoundly disappointed" about NCAA allegations against IU basketball coach Kelvin Sampson, including that Sampson misled investigators checking allegations of impermissible recruiting calls.

"It is regrettable, to say the least, that we are in this position to respond to these allegations," Athletic Director Rick Greenspan said at a news conference.

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Read: NCAA Allegations Against IU Basketball Program

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In a report given to IU last week, the NCAA alleged Sampson (pictured) and two assistants committed major violations, including by not complying with telephone recruiting restrictions that were imposed because of his previous violations at Oklahoma. The NCAA also alleged Sampson and one assistant misled the school and/or the NCAA during an investigation.

Some of the allegations are based on the school's own reports to the NCAA about impermissible calls linked to Sampson. In those October reports, IU contended the violations were minor and that there was no indication that Sampson or his staff intentionally sought to circumvent the rules.

However, the NCAA report said those and other alleged violations were major -- not minor -- and said Sampson gave "false or misleading information" when investigators probed the situation.

Major violations of NCAA rules can carry punishments including postseason ineligibility. The NCAA has asked IU to reply to the allegations in writing by May 8 and to send officials to a June 14 hearing by the Division I Committee on Infractions.

At a news conference Wednesday, Greenspan said he was "profoundly disappointed that there is a hint of inappropriate behavior."

"(Sampson) understands my perspective on this. I've shared that with him consistently and regularly and will continue to," Greenspan said.

Greenspan stressed that "these are allegations, and ... the NCAA as an organization believes in due process, and I think that's appropriate to provide."

Sampson coached No. 13 Indiana during Wednesday night's 68-66 loss at home to No. 15 Wisconsin. The Hoosiers are 20-4 this season.

In a statement read after the game, Sampson said: "The allegations that I knowingly acted contrary to the sanctions that occurred while I was at Oklahoma are not true."

"I have never intentionally provided false or misleading information to the NCAA. I intend to work within the NCAA process on this matter, and I look forward to my opportunity to do so," Sampson said.

He said he would not comment further until after an NCAA hearing in June. Sampson repeatedly refused to answer additional questions.

Greenspan would not say whether the school planned to impose additional sanctions on the program, but acknowledged Sampson's contract contains a clause in which he could be fired for cause if the NCAA rules Sampson committed major violations.

Indiana has already forced Sampson to forfeit a $500,000 pay raise and one scholarship next season in connection with its October report.

"I think the sanctions we established on Oct. 3, we felt were very significant and we felt very appropriate for the information at that point in time," Greenspan said. "Any additional self-imposed sanctions would come out of a collective thought process and we have not made any decision on that."

Coach Misled Investigators, NCAA Says

The NCAA report, which IU made public Wednesday, comes more than three months after the university announced that its investigation found Sampson made more than 100 impermissible phone calls while still on NCAA probation for infractions he committed during his tenure at Oklahoma.

Sampson was found to have made 577 impermissible calls from 2000 to 2004 and was punished by the NCAA in May 2006, less than two months after taking the Indiana job. Sampson was banned from calling recruits and making off-campus visits for one year.

Among the restrictions imposed on Sampson was a prohibition from participating in three-way calls. But the university found Sampson was involved in at least 10 three-way calls, most patched through by then assistant coach Rob Senderoff.

Sampson said in October he was unaware he was participating in a three-way conversation on nine occasions.

IU then imposed its own sanctions on Sampson -- making him forfeit a $500,000 pay raise and one scholarship next season. Senderoff also was punished by forfeiting any bonuses or salary increases for one year and later resigned.

The NCAA alleges not only that the impermissible calls were major violations, but also that Sampson misled IU and NCAA investigators about the violations.

Sampson "failed to deport himself ... with the generally recognized high standard of honesty normally associated with the conduct and administration of intercollegiate athletics by providing the institution and the NCAA enforcement staff false or misleading information," according to the report.

IU has had no NCAA major violations since 1960. Greenspan said IU "will cooperate fully with the NCAA as they adjudicate these charges."

The allegations in the NCAA report are:

That Sampson, Senderoff and assistant coach Jeff Meyer failed to comply with sanctions imposed on Sampson for impermissible recruiting calls he made while he was a coach at Oklahoma -- sanctions that followed him to IU when he took the job in 2006. Sampson and Senderoff are alleged to have jointly participated in telephone calls at a time when Sampson was prohibited from being present or taking part when staff members made recruiting calls. Senderoff and Meyer are alleged to have made about 100 calls that exceeded the sanction limits. Senderoff resigned his position Oct. 30.

That Senderoff and Meyer placed at least 25 telephone calls to nine potential recruits that exceeded NCAA limits even if no sanctions had been in place.

That Sampson acted contrary to the NCAA principles of ethical conduct when he knowingly violated recruiting restrictions imposed by the NCAA Committee on Infractions, and that he failed to deport himself in accordance with the generally recognized high standard of honesty normally associated with the conduct and administration of intercollegiate athletics by providing the institution and the NCAA enforcement staff false or misleading information, and that he failed to promote an atmosphere for compliance within the men's basketball program and failed to monitor the activities regarding compliance of one or more of his assistant coaches.

That Senderoff acted contrary to the NCAA principles of ethical conduct when he knowingly violated recruiting restrictions imposed by the NCAA Committee on Infractions, and that he failed to deport himself in accordance with the generally recognized high standard of honesty normally associated with the conduct and administration of intercollegiate athletics by providing the institution false or misleading information.

That Sampson and Meyer engaged in an impermissible recruiting contact during a two-day sports camp held at Assembly Hall on June 30 and July 1, 2007, and that Meyer provided the potential recruit with an impermissible benefit -- at least one T-shirt and drawstring backpack.