Chelsea only have them to blame for the failure to go past Manchester City after forward Nicolas Jackson missed multiple crucial opportunities to score at least one goal.
In the 87th minute, substitute Antony sent the game into extra time.
“I just wanted to send this farewell message to all Manchester United supporters,” the 32-year-old posted on Instagram on Saturday.
“Following a diagnosis of cholecystitis, he will be undergoing surgery to remove his gallbladder today (Wednesday).”
Casemiro scored twice as Manchester United defeated 10-man Reading at Old Trafford to reach the fifth round of the FA Cup on Saturday night.
Connor Maseko was given the marching order when he decided to urinate during an Emirates FA Cup tie.
Meanwhile, in response to Chelsea’s request, the FA said “The matter will be discussed at the Professional Game Board meeting tomorrow.”
