[7] In 2016, Mottier joined VC Pays de Loudéac, with the goal of eventually moving into the professional ranks.

[8] He had a successful season, notably winning the Circuit du Morbihan [fr], La Castelbriantaise and the first stage of the Boucle de l'Artois.

[4] While riding with the team, Mottier competed in the Tour of Utah and several one-day races in Belgium, including the Grote Prijs Jef Scherens.

Two weeks later, he entered his first World Tour events, taking part in the Amstel Gold Race followed by the La Flèche Wallonne.

After falling ill and suffering a fractured collarbone while training in December 2019, Mottier only competed in three races before the Covid-19 pandemic, including the Tour de Langkawi.