Fehse, a 6 ft 11 in power forward, began playing professionally for SV Halle in 2000.

In 2004, he joined the New Yorker Phantoms Braunschweig for three seasons, but was unable to provide any impact due to injuries.

In 2008, he joined the team of SG Braunschweig in the German second league to gain some playing experience.

Fehse also has made appearances for the German national youth team in the 2000 qualifying tournament for the FIBA World Championship.

On 22 December 2009 Fehse's rights were traded by the Oklahoma City Thunder (formerly the Seattle SuperSonics) to the Utah Jazz for Eric Maynor and the contract of injured forward Matt Harpring.