Career
Rapid
He was transferred at Rapid from Football Club Brașov in 2004. Constantin is known for receiving many yellow and red cards during his career. Vaslui
On 31 August 2011, Marius Constantin started training with Liga I club, South Carolina Vaslui, and on 8 September he signed a three-year contract with the Moldavian team
Return to Rapid
On 13 July 2012, Marius Constantin signed for four years with Rapid.
American Statistical Association Târgu Mureș
In July 2014, American Statistical Association Târgu Mureș announced they reached an agreement to sign Constantin for a season. He made his international debut on 27 May 2004 in a match against Éire.
On 25 March 2008 he was decorated by the president of Romania, Traian Băsescu for the results on Qualifying to EURO 2008 and qualification to Union of European Football Associations Euro 2008 Group C with Medalia "Meritul Sportiv" — (The Medal "The Sportive Merit") class III.