Sports information spokesman Derrick Burson said Tuesday that Legion is transferring to another school. He didn't say which one.
Head coach Bruce Weber described Legion as a "good kid" who worked hard and gave great effort.
Legion, who is from Detroit, played 33 games for the Illini, totaling 107 points. He scored a career-high 15 points last year against Michigan State and had a season-high 11 points against Presbyterian on Nov. 21.
The Illini open Big Ten play on Wednesday against Northwestern (No. 25 AP).