Career
He has played more than 200 games for Brøndby IF. He started his career in the youth teams of Danish clubs Rishøj IF and Køge Boldklub, before he made his debut for Køge in the second-tier Danish 1st Division league in 1999. He was called up for the Danish under-21 national team in 2001, which he represented in three matches, coming on as a substitute in all three games. In 2002, Køge earned promotion to the top-flight 2002-2003 Superliga season, but following only one Superliga match for the club he was injured in late July.
He was one of the first signings of new Brøndby IF coach Michael Laudrup, who played Retov in a centre midfield duo with Morten Wieghorst.
On 8 July 2008, he joined 2. Bundesliga side F.C. Hansa Rostock.
Here he established himself in the starting 11 and was appointed captain. On July 6, 2010, Retov joined Danish Superliga team Air Corps Horsens.
Martin Retov repealed in 2015 his contract with Air Corps Horsens, not knowing if he would continue his active football career.
A few weeks later he announced that he retired and instead wanted to try being a coach. As at start he is coaching AGF"s u17 team as assistant coach. He has played six games for the Denmark national football team