At 17, he had 36 points (14 goals, 22 assists) in 51 games for Jukurit, seven points in five games at the Under-18’s, played seven games at the IIHF World Juniors in Sweden, and saw limited action at the World Championships in May 2024. The Sabres were fortunate to have Helenius fall to them at 14th overall after many draft analysts labeled him nearly pro-ready after playing in Liiga, for Finland at the Under-18’s, World Junior Championships, and World Championships.