[5] Following an outstanding season he named the NCHC Goaltender of the Year, and a unanimous All-NCHC First Team selection.
[1] He was also named an AHCA West First Team All-American and a top-three finalist for the Mike Richter Award.
[1] Mbereko represented the United States at the 2021 IIHF World U18 Championships where he appeared in three games and recorded one win with a 2.85 GAA and .915 save percentage.
[9][10] Mbereko represented the United States at the 2022 World Junior Ice Hockey Championships, where he recorded three wins and one loss, with a 1.76 GAA and .921 save percentage.
[11][12] He again represented the United States at the 2023 World Junior Ice Hockey Championships where he recorded one win and one loss, with a 4.64 GAA and .829 save percentage and won a bronze medal.