He has previously played for São Paulo in his homeland, then Yokohama F. Marinos and Gamba Osaka in Japan as well as Wuhan Three Towns in China.

On 22 July 2012, his Campeonato Brasileiro debut, Ademilson scored a goal against Figueirense in a game at the Orlando Scarpelli Stadium.

[5] On April 23, 2014, in the first leg of the second round of the Copa do Brasil, in a 2-1 São Paulo FC loss against CRB, Ademilson scored a beautiful bicycle kick goal.

[2] He was loaned to another J League side, Gamba Osaka, in 2016,[7] and debuted for them in their 3–1 loss to Sanfrecce Hiroshima in the 2016 Japanese Super Cup on February 20 of that year.

[12] After showing his qualities in several Brazilian youth football competitions, according to himself, Ademilson thought of his style of play as similar to Luís Fabiano, a former colleague of his at São Paulo FC.