Arsenal midfielder Willian has revealed that he has been sent racist abuse on social media.
"We cannot and will not let racist and hateful abuse become a normalised part of the game," Arsenal said.
In the past week, Manchester United's Anthony Martial has received abuse on Instagram and Arsenal's Eddie Nketiah has been targeted on Twitter.
A Twitter spokesperson said the account responsible for posting the Nketiah abuse had been "permanently suspended".
It was the second time in three weeks that Martial had been abused, while team-mates Marcus Rashford and Axel Tuanzebe have also faced racism online.