KANSAS CITY, Mo. -- A television report that Kansas basketball star Darrell Arthur may have been ineligible to play at his Dallas high school has fueled speculation about whether he should have ever played for the national champion Jayhawks.

A former math teacher at South Oak Cliff High School in Dallas told WFAA-TV in Dallas-Fort Worth that Arthur's grades were altered to show he passed math when he hadn't.

The 6-foot-9 Kansas sophomore was instrumental in leading Kansas to its national championship, finishing second in scoring at 12.8 points a game and second in rebounding. He had 20 points and 10 rebounds in Kansas' national title win against Memphis.

Arthur has applied for early entry into the NBA draft but did not sign with an agent, so he could return to Kansas.

Arthur was one of the nation's top recruits out of high school. The McDonald's All-American led South Oak Cliff to consecutive state titles, earning tournament MVP both times. However, the school had to forfeit its 2006 state championship because of similar academic problems with another player, Kendrake Johnigan.

The station said the NCAA told it that if a player is found to be ineligible, his college team might have to forfeit any or all games involving that student.

But Jim Marchiony, KU's associate athletic director for external affairs, said he believed that the investigation into Arthur likely would not affect the school's basketball program.

"This is something that happened in high school," Marchiony said. "Everything that is discussed right now is speculation. I know the media and fans like to speculate, but that's not something we participate in."

Marchiony said high schools send athletes' transcripts to the NCAA, which determines whether an athlete is eligible to play in college. Because the NCAA declared Arthur eligible, Kansas would not have known about any grading problems in high school, he said.

"I believe that the school district is looking into it," Marchiony said. "Right now, the only thing any of us can do is wait to see the result of that process."

Kansas coach Bill Self said in a statement that it's too early to comment on the report because all the facts are not known.

"We are aware of the allegations as described in the news story," Self said. "I'm sure the high school and the school district will do a good job determining the facts. It would be premature and inappropriate for anyone to comment any further until the process in Dallas takes its course."

A secretary at South Oak Cliff, who would not give her name, said no one at the school was available for comment and referred all questions to the high school association.