Behrens began his career with Hamburger SV, breaking into the reserve team in 2008. The following year, he was promoted to the first team, but never made an appearance, continuing to play regularly for the reserves over the next three seasons.
In 2012, he moved to Darmstadt 98 and made his debut for the club in August of that year, as a substitute for Elton da Costa in a 3–1 defeat to Chemnitzer FC, in which he scored Darmstadt's only goal.
In July 2017, Behrens agreed to a contract extension with 1. FC Nürnberg.[1] On 6 May 2018. he scored as Nürnberg won 2–0 against SV Sandhausen to clinch promotion to the Bundesliga.[2]
In June 2021, Hansa Rostock announced the signing of Behrens on a free transfer for the 2021–22 season. He signed a one-year contract with an option.[3]
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