The 22-year-old Brazilian international forward was targeted during a 1-0 defeat at Valencia on Sunday and was later sent off.
Vinicius issued a strongly worded statement afterwards saying that LaLiga “belongs to racists” and several Brazilian players past and present offered their support.
Brazilian President Luiz Inacio Lula da Silva condemned the abuse, telling a news conference at the close of the G7 summit in Hiroshima, Japan: “He was attacked. He was called a ‘monkey’.”
Vinicius has frequently been targeted in LaLiga and the latest incident came at Valencia’s Mestalla when he was racially abused by a home supporter.
Vinicius stood in front of fans behind the goal and pointed to the apparent culprit. Play was delayed for several minutes in the second half.
Referee Ricardo de Burgos Bengoetxea spoke to stadium officials, who made an announcement calling for racist insults to stop before play resumed around 10 minutes later.
In his post-match report, the referee wrote that a fan shouted “monkey, monkey” at the player.
Vinicius was sent off in added time at the end of the game for hitting Hugo Duro during a brawl, with Valencia triumphing through Diego Lopez’s first-half goal.
Vinicius left the pitch making a gesture with his hands indicating Valencia were heading down to Spain’s second division.