After 18 years in youth coaching, which included spells as manager of multiple Danish national youth teams, Frank became a senior manager with Brondby in 2013.
After his departure in 2016, he moved to English club Brentford as assistant head coach, and was promoted into the role of head coach in October 2018.
At the end of the 2020–21 season, Frank became only the second Brentford head coach or manager to achieve promotion to the top-flight of English football.
Frank was a part of the BBC’s coverage of Euro 2024.