On 20 January 2015, after an unsuccessful loan spell at Fiorentina, Marin joined Anderlecht for the remainder of the season, with an option to buy at the end of the campaign. Five days after moving to Belgium, Marin made his debut coming off the bench, replacing Maxime Colin in the 75th minute in a 2–0 loss to Standard Liège. Marin was in the starting line-up of the Belgian Cup Final, although he was substituted in the second-half after suffering a hamstring injury as Anderlecht lost 2–1, with Lior Refaelov scoring a late volley.