Casemiro was sent off after Manchester United and Crystal Palace players clashed at Old Trafford
United midfielder Casemiro was sent off for grabbing Will Hughes during a mass confrontation in the second half.
It was sparked by Palace midfielder Jeffrey Schlupp barging United winger Antony into touch and both were booked.
United have accepted the charge while Palace have denied it.
A Football Association spokesperson said: "Manchester United and Crystal Palace respectively accepted and denied that they failed to ensure their players conducted themselves in an orderly fashion and refrained from provocative behaviour.
"An independent regulatory commission subsequently found the charge against Crystal Palace proven and imposed both the clubs' fines."
-- Courtesy of BBC Sport