Career
He had a 3 1⁄2-year-long successful stint in Gefle IF, but left the club in November 2011, signing a three-year contract with Hammarby. He left Hammarby in November 2014, after a three-year stint at the Stockholm based club Theorin previously played for Football Club Lyn Oslo in the Norwegian Premier League and Malmö FF whom he left in June 2008.