Vinicius Junior's Real Madrid future has been repeatedly called into question amid links to the cash-rich Saudi Pro League.
The league has analysed images and utilised lip-readers to identify those responsible for the alleged racist abuse.
The Brazil international's current terms run until 2027 with talks having begun last month over extending them.
Vinícius Júnior has said he wants to renew his contract at Real Madrid "as soon as possible" despite ongoing links with a big-money move to Saudi Arabia.
Vinicius Jr says he is "living the dream" at Real Madrid ... and Vinicius goes into the game with 102 goals from 300 appearances for the club. "My child dream was to make it here," he added.
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