 He sustained a concussion on March 13 and missed the remainder of the season.Sulzer signed a five-year contract with Kölner Haie on May 1, 2014.At the conclusion of his contract in Cologne, Sulzer opted to leave as a free agent and return to former club, Düsseldorfer EG, then known as the Metro Stars, signing a one-year contract on May 9, 2019.