On 4 August 2016, Jenssen transferred from Lyon II to sign a three-and-a-half-year with Tromsø.[1]
After joining FC Nordsjælland in January 2018,[2] Jensen left the club again in the summer 2021.
In July 2021, Jenssen signed a three-year contract with Eredivisie club Willem II.[3] His contract was terminated by mutual consent on 20 June 2022, after the club had suffered relegation.[4]
Jenssen returned to Nordsjælland on 19 August 2022, signing a contract until December 2022.[5]
In November 2022, Jenssen signed for Rosenborg, joining the club from January 2023.[6]
International career
In 2016, he was called up to the Norway national football team despite not having played a senior first-team match for any club.[7]