Southern California is looking into whether it may have violated NCAA recruiting rules while pursuing highly rated recruit Joe McKnight, a university official said. McKnight signed a national letter of intent with USC on Wednesday and made comments during a news conference that seemed to suggest communications involving former Trojan Reggie Bush, who is now with the New Orleans Saints. Former players are forbidden from telephoning prospective recruits, their relatives or guardians. "We're aware of it, and we are looking into it," sports information director Tim Tessalone told The Associated Press late Thursday.