Matheus Fernandes Siqueira (born 30 June 1998) is a Brazilian professional footballer who plays as a central midfielder for Red Bull Bragantino, on loan from Palmeiras.

He was called up to the 2016 pre-season with the main squad,[1] but was only promoted to the first team by manager Jair Ventura; late in the year, he renewed his contract until the end of 2019.

A backup to regular starters Felipe Melo and Bruno Henrique, he was not registered for the year's Campeonato Paulista, and only made his debut for the club on 1 May, replacing Moisés in a 1–1 away draw against CSA.

On 31 January 2020, just hours after signing for Barcelona, Fernandes joined fellow La Liga side Real Valladolid on loan from Palmeiras.

[9] On 31 January 2020, Barcelona announced that they had reached agreement with Palmeiras for the transfer of Fernandes, who would join the Catalan club ahead of the 2020–21 season at the end of September, after completing his loan spell with Real Valladolid.