The 6-foot-9, 205-pound Tillie is averaging 17 points and nine rebounds per game for Paris Basket Racing's Junior Team, one of the top club teams in the country.
Tillie has been described as an athletic, skilled forward who would be a Top 100 caliber player in the senior class, according to a pair of college coaches who have seen him play.
Tillie, 17, who is expected to start for the French under-18 national team this summer in the European Championships, recently took visits to Florida, Old Dominion and most recently, visited Utah last week.
The Utes, who are making a strong push internationally, saw him this past summer.
"Kim is one of the brightest young stars in the country of France," Utah coach Ray Giacoletti said in a statement. "As a 17-year-old, he already has a great deal of international experience. He is extremely athletic for his size and has the chance to be a very good player. He has the ability to shoot from perimeter as well as create off the dribble. Kim also is an active rebounding presence inside. We are very excited to have him."