West Ham defender Arthur Masuaku has had surgery "to help remove the pain that's been bothering me for nearly two years".
After the game, manager David Moyes said Masuaku, 27, had undergone successful surgery on his right knee.
"It's been a very difficult decision to make," tweeted Masuaku, who has made 11 appearances in 2020-21, on Saturday.
"But for my good being and the rest of my career I have to make it."
West Ham midfielder Tomas Soucek dedicated the win against Leeds to the club's fans and Masuaku, adding on Twitter: "I keep my fingers crossed and wish you a quick return.