In 2015, Otten started his coaching career as an assistant with
Den Bosch. In June 2019, Otten was named an assistant coach of the Dutch men's national team, serving under
Maurizio Buscaglia. He joined the team for the
EuroBasket 2022 in Prague. On 9 August 2020, Otten signed as head coach for newly established club
Basketball Community Gelderland, marking his debut as head coach in the
Dutch Basketball League. Later, the club was named Yoast United. With Yoast, he managed to qualify for the final of the
2021 DBL Cup where the team lost to
BAL Weert. On May 25, 2021, Otten signed a two-year contract as the head coach of
Donar, with the option for a third season. On March 20, 2022, he won the
Dutch Cup with Donar, guiding the team to its first trophy since 2018. In the national playoffs, Donar was swept by rival
Heroes Den Bosch in the semifinals; however, the team reached the BNXT playoff finals, where they lost to
ZZ Leiden. On October 13, shortly after the start of the 2022–23 season, Otten was fired by Donar after losing the first two official games of the season. On June 7, 2024, he was named head coach of Austrian side
Oberwart Gunners. He won the Austrian Championship title in 2025. Otten left Oberwart on August 1st, 2025, to accept an offer from
Manchester Basketball. ==Awards and accomplishments==