[citation needed] Trémoulinas received the number 28 shirt and served as backup to the younger Florian Marange and elder Franck Jurietti.

In total with the team, he appeared in 31 matches scoring his only goal of the season against Guingamp in a 4–2 victory in the Coupe de la Ligue.

[citation needed] On 31 January 2014, Trémoulinas was loaned out to Saint-Étienne until the end of the season, after falling down the pecking order while at Dynamo.

[citation needed] On 24 August 2014, Trémoulinas signed a three-year contract with La Liga club Sevilla, initially as a replacement for Liverpool-bound Alberto Moreno.

[16] He made ten appearances as they won the UEFA Europa League in his first season, including the 3–2 win over Dnipro in the final in Warsaw.