In the 1983–84 season, he reached with Dinamo the semi-finals of the European Cup, where they lost to eventual winners Liverpool.

Marin has managed a number of teams in his native Romania, including the youth team of Dinamo Bucharest, Pandurii Târgu Jiu, Flacăra Moreni, Petrolul Ploiesti, Farul Constanţa, Astra Ploieşti, Dinamo Bucharest, Universitatea Cluj and Bihor Oradea (autumn 2002 and as of October 2005).

On 3 October 2011, the experienced coach signed a two-year contract with UAE Pro-League side Dubai Club.

In July 2012, Marin was hired as manager by Kuwait SC and during his first season in charge, he won the Kuwaiti Premier League and AFC Cup.

In January 2016, he was appointed manager of Iraqi side Zakho FC replacing Ilie Stan.