Fred was sent racially abusive messages on social media after Manchester United's FA Cup quarter-final defeat to Leicester City on Sunday.
The comments section on the midfielder's Instagram posts were targeted with monkey emoji's following the defeat.
Other comments telling the Brazilian to 'go back to the favelas' followed the final-whistle, on the same day that 17-year-old Jude Bellingham was sent racist abuse.
Fred struggled throughout the Sunday game and was at fault for Kelechi Iheanacho's opener
Fred endured one of his worst matches in a United shirt, struggling under Leicester's intense pressure as the Foxes ran the show.