Instead of entering high school, he applied to New Japan Pro-Wrestling (NJPW), who sent him to the New Japan dojo. He was in the same class as Keiichi Yamada (better known as Jyushin Thunder Liger), Keiji Mutoh, Shinya Hashimoto, Minoru Suzuki, Masahiro Chono, and Chris Benoit. The New Japan Dojo had a reputation for being particularly harsh on its trainees, both mentally and physically, with the intent of only graduating the very best of each class. However, Funaki stunned the New Japan trainers with his athleticism, timing and natural talent for submission grappling. Along with the former Highschool Wrestler Minoru Suzuki, Funaki formed a strong bond with the dojo's head grappling instructor, Yoshiaki Fujiwara. Funaki debuted as a junior heavyweight at the age of 15; a record for the youngest debut in NJPW.