Career
Behrendt started playing football with local clubs Bremervörder South Carolina and TuS Heeslingen. In 2006 he joined the youth ranks of Northern German heavyweight Hamburger SV, but switched to Rapid Wien at the age of 16 when his father moved to Austria for work. He joined First League side SV Horn on loan in January 2013 for the remainder of the 2012-2013 season.
After returning to Rapid Wien, Behrendt made his first-team debut as an extra-time substitute in an Austrian Cup penalty shootout defeat to LASK Linz on 14 July 2013.
He missed most of the 2014-2015 season with a broken metatarsal, and he joined Arminia Bielefeld in July 2015.