Villanova freshman forward Mouphtaou Yarou has tested positive for the Hepatitis B virus, the school announced on its Web site, and no timetable has been set for his return.
Yarou is being treated under the supervision of team physician Dr. Frank Furman, the school said.
"We are disappointed for Mouph," coach Jay Wright said in a statement. "We know that he is receiving great care from Dr. Furman and some of the best specialists in this field. Mouph's health is our foremost concern."
Yarou started Villanova's first two games this season, averaging 5.0 points and 4.0 rebounds in wins over Fairleigh Dickinson and Penn. He did not appear in any of Villanova's three games at the Puerto Rico Tip-Off after he returned to Philadelphia for testing.