Following the game a video emerged of Casemiro celebrating with fans.
Manchester United hosted Manchester City in the Premier League on Saturday and celebrated a 2-1 victory as Bruno Fernandes and Marcus Rashford scored for United.
Meanwhile, Jack Grealish scored for City during the game.
United are currently 3rd in the league table with just one point behind City, who are second.
Following the game, a video has emerged of Casemiro celebrating with fans.