In a statement, Jayhawks director of athletics Sheahon Zenger said the NCAA has notified the school about an issue that could affect Alexander's eligibility.
"As a precautionary measure Cliff will not take the court until we have resolved the issue," Zenger said.
The matter is significant enough that Alexander's camp has enlisted a Washington, D.C.-based attorney to help navigate the issue, SI.com has learned. Alexander's family deferred comment to the attorney when reached Saturday, suggesting it is at least preparing a strong answer for the NCAA. The school said it would have no further comment until the issue is resolved.
Alexander was the No. 4 player in the class of 2014, per Rivals.com, but has battled inconsistencies all season. He has averaged 7.1 points and 5.3 rebounds in 17.6 minutes per game overall during Kansas' push for an 11th straight Big 12 title.
In order to spark Alexander and take advantage of his size, Kansas inserted him into the starting lineup six games ago. But Alexander still hasn't found the rhythm, totaling just six points and averaging just 12.3 minutes in his last four games.
The No. 8 Jayhawks lead West Virginia, Iowa State, Oklahoma and Baylor by one game for first place in the Big 12.
"Cliff is one of the best kids I’ve ever coached," Kansas coach Bill Self told SI.com on a recent day off. "I love coaching him. But it can be frustrating at times, because I don’t think he uses his energy level and body the way he potentially can. And he’s been inconsistent. But he’s also a freshman. The way he scored in high school, he overpowered people. He has to develop technique now and do some things.
"But we need, we desperately need, a physical presence, a rim protector, a guy that people think twice about coming in there against," Self continued. "And I think he can become more consistent with that."