Ballou joined the Montreal Impact Academy in 2012. In 2013, he left the club to join Panellinios Montreal. The coaches had discovered him 2 years earlier, at the age of 12, when he had just arrived from Ivory Coast.

He finally joined the Montreal Impact team in 2015. In 2016, he signed a two-year professional contract. At the age of 17, Ballou became an ally for the Montreal Impact in the North American Major League Soccer (MLS). He is the youngest player in club history to join the team.

In 2018, Ballou left the Montreal Impact to join FC Barcelona in Europe. He is the first club-trained player to leave Montreal for Europe.

Wesley was part of the ESMCanada program from 2010 to 2012.He has participated 3 times in the international mundialito tournament. In August 2014, he moved to Portugal to join the club Esperança  de Lagos. In 2015, he signed with Belenenses  and carried the colors of the blues until January 2019, transfer after Estoril Praia to end the season with the U19 in the National Division.

He signs his first senior contract in 2019 with Estoril de Praia for the 2019/2020 season with team B.

Wesley continues to grow with support and follow-up from ESMCanada to ensure a good development.  

At the age of 16, Josué was a goalkeeper for Sporting Club of Portugal in the First Portuguese League. He spent the 2015-2016 season with the CF Belenenses team which is also part of the First Portuguese League.

Josué joined Haiti's National Under-20 Football Team for the 2017 CONCACAF U-20 Championship.