El Mesrar arrived in France in August 2018 and signed with Montpellier Méditerranée Futsal alongside his compatriot Bilal Bakkali.

[3] In the next match, in Corsica, El Mesrar contributed to his team's victory on the court of Entente Furiani (6-0) by scoring four goals.

[14] After a season at MMF, he joined, along with Bilal Bakkali, ACCS FC,[15] a club competing in the elite of French futsal.

[18] In the following round, ACCS secured a 9-3 home victory against Sporting Club de Paris, with a goal and an assist from the Moroccan.

[19] On 3 November 2019, ACCS dealt a heavy blow to Roubaix AFS with an 18-1 victory, during which El Mesrar scored a hat-trick.

[24] On October 10, 2020, during the fourth round, ACCS delivered a crushing defeat (14-2) to newly promoted Chavanoz, with a goal from El Mesrar.