AC Milan striker Zlatan Ibrahimovic revealed his dismay over Sulley Muntari's disallowed goal in Saturday's 1-1 draw against Juventus.
Muntari's close-range header crossed the goal-line before it was scooped out by Gianluigi Buffon, but the assistant referee failed to spot the ball cross the line even though he seemed to be in a good position to judge the play.
"Muntari's goal, which the linesman did not see, is a tragedy for football," Ibrahimovic said during a press conference.
"I was more than disappointed, I was angry. Everyone saw that it was a goal. One can make a mistake in an offside situation, but not something like this."
Ibrahimovic then commented on his slap to Napoli defender Salvatore Aronica, which saw him miss the match against Juventus as part of his three-game ban.
"The opponents will always do everything to stop me," Ibrahimovic said. "You have to learn from your mistakes and try not to repeat them.
"But I cannot say that something like this will not happen again in the future.
"There is always a lot of tension on the field."