Ligue 1 side Nice expressed their interests in signing Brüls and on 29 June 2013, he joined Nice on a season long loan deal, with an option of signing the player permanently.
Upon joining the club, Brüls was given number ten shirt for the new season.

Brüls made his Nice debut, in the opening game of the season, making his first start, in a 4–0 loss against Lyon.
In a match against Lille on 15 September 2013, Brüls provided a double assist for Darío Cvitanich, in a 2–0 win and it was followed up by scoring his first Nice goal, in a 4–0 win against Valenciennes.
His performance throughout September earned him an award for Player of the Month by Nice supporters.
January  saw Brüls scored three more goals in all competition against Nantes, Ajaccio and Marseille.
As the 2013–14 season progressed, Brüls went on to make thirty–eight appearance and scoring four times in all competition.

Following the conclusion to the season, it was announced that the club decided against signing Brüls on a permanent basis, citing sporting and financial as the main factor.
Ligue 1 side Nice expressed their interests in signing Brüls and on 29 June 2013, he joined Nice on a season long loan deal, with an option of signing the player permanently. Upon joining the club, Brüls was given number ten shirt for the new season.
Brüls made his Nice debut, in the opening game of the season, making his first start, in a 4–0 loss against Lyon. In a match against Lille on 15 September 2013, Brüls provided a double assist for Darío Cvitanich, in a 2–0 win and it was followed up by scoring his first Nice goal, in a 4–0 win against Valenciennes. His performance throughout September earned him an award for Player of the Month by Nice supporters. January  saw Brüls scored three more goals in all competition against Nantes, Ajaccio and Marseille. As the 2013–14 season progressed, Brüls went on to make thirty–eight appearance and scoring four times in all competition.
Following the conclusion to the season, it was announced that the club decided against signing Brüls on a permanent basis, citing sporting and financial as the main factor.
Christian Brüls