Milan forward Zlatan Ibrahimovic was subbed off in the second half of Juventus-Milan with a knee injury.
The Swede was fighting for the ball in the middle of the pitch when he fell to the floor, holding his knee.
He tried to remain on the pitch, but after a few seconds, he was eventually replaced by Ante Rebic as he was unable to resume the game.
The 39-year-old left the pitch shaking his head. He remained on the sidelines until the end of the game to witness his side's triumph over the Bianconeri.
Milan forward Zlatan Ibrahimovic was subbed off in the second half of Juventus-Milan with a knee injury.
The Swede was fighting for the ball in the middle of the pitch when he fell to the floor, holding his knee.
He tried to remain on the pitch, but after a few seconds, he was eventually replaced by Ante Rebic as he was unable to resume the game.
The 39-year-old left the pitch shaking his head. He remained on the sidelines until the end of the game to witness his side's triumph over the Bianconeri.
It remains to be seen how long he will remain out of action.
Milan were 1-0 up when Ibrahimovic was replaced.
Rebic doubled Milan's lead after 78 minutes and Fikayo Tomori made it three in minute 82.
"Ibra wasn't fit before the game, now he feels pain in his knee and we hope it's nothing too serious," Milan coach Stefano Pioli told Sky Sport after the final whistle.