Toronto FC and loans He joined
Toronto FC II of
USL League One for the 2021 season, as an academy call-up. He made his debut for Toronto FC II on May 22, 2021 against
North Texas SC. He joined
Toronto FC III during the summer for the
2021 League1 Ontario Summer Championship season. He attended the
first team's pre-season in 2022, scoring the tying goal in the 89th minute in an exhibition match against
Sporting Kansas City. He scored his first official professional goal on April 10, scoring twice against
New York City FC II in
MLS Next Pro. He signed his first professional contract with
Toronto FC II on May 27 (he had been playing on an academy contract prior to this). In September 2022, he signed a
Homegrown Player contract with the first team,
Toronto FC in
Major League Soccer, through the year 2025, with an team option for 2026. On October 9, he made his first team debut, as a substitute, in the final game of the 2022 against the
Philadelphia Union. In April 2023, he was loaned to
Toronto FC II. In March 2024, he was loaned to
San Antonio FC of the
USL Championship for the 2024 season. He scored his first goal in his debut on March 23 against the
Colorado Springs Switchbacks. In March 2025, he was loaned to
Lexington SC in the USL Championship. In July 2025, he was recalled from his loan with Lexington and immediately re-loaned to
Vancouver FC in the
Canadian Premier League. He scored his first goal for Vancouver on August 4, 2025, in a 2-1 victory over
HFX Wanderers FC. In October 2025 Toronto FC would decline Mbongue's contract option, ending his time at the club after four years.
Crown Legacy FC In February 2026, he signed with
Crown Legacy FC for the 2026 season, with options through June 2029. On March 6, 2026, he made his debut and score is first goal in a 7-2 victory over
Huntsville City FC. ==International career==