Kansas forward Cliff Alexander remains sidelined because of an NCAA inquiry into possible impermissible benefits received by one or more of his family members from an NBA agent, multiple sources have told Yahoo Sports.

Alexander has not yet been interviewed by the NCAA, sources said, though not because of a reluctance by either the school or NCAA investigators. Sources said legal counsel has been retained by the Alexander family and that may be slowing the investigative process.

View photos Cliff Alexander has missed the Jayhawks' past two games. (USA Today) More

Alexander will not be reinstated until after an NCAA interview occurs and a decision is made on whether benefits received by his family are impermissible. If it is ruled that a violation occurred, Alexander's eligibility for the remainder of the season could be affected.

Mike Oliver, who coached the five-star recruit in Chicago at Curie High School, told Yahoo Sports Thursday that he visited Alexander Feb. 21 when the Jayhawks played TCU and was concerned.

"I knew something wasn't right," Oliver said. "He just wasn't Cliff."

A week later, Alexander was sidelined with what the school termed an "NCAA issue." Kansas has not commented on the nature of the issue, but sources confirmed to Yahoo Sports that it is agent-related.

Alexander has missed the No. 9 Jayhawks' past two games, victories over Texas and West Virginia. That hasn't prevented Kansas (24-6, 13-4) from winning yet another Big 12 championship. But Saturday Kansas goes to Oklahoma and is expected to be without Alexander, fellow forward Perry Ellis (sprained knee) and possibly guard Wayne Selden (ankle).

Before he was sidelined by the NCAA issue, Alexander's playing time had plummeted in recent weeks. He played fewer than 20 minutes in seven of his last nine games, bottoming out a total of 27 minutes played in three games against West Virginia, TCU and Kansas State Feb. 16-23. Alexander scored just 28 points in the month of February.