Arsenal manager Arsene Wenger has accused Manchester United of adopting "anti-football" tactics after a fiery meeting between the Premier League title hopefuls last weekend.
United were 2-1 winners over the Gunners, coming from behind after Andrey Arshavin had given the visitors the lead.
Arsenal were arguably the better team but were responsible for their own downfall when Manuel Almunia tripped Wayne Rooney to concede a penalty before Abou Diaby inexplicably headed into his own net.
Wenger was then sent to the stands for kicking a water bottle after Robin van Persie's late strike was disallowed for offside.
That capped a week of perceived injustice for Wenger after Eduardo was charged by UEFA over his alleged dive to win a penalty in the Champions League win over Celtic.
The Frenchman, though, compared Eduardo's behaviour favourably with the tough-tackling of United at Old Trafford.
"I have seen a player who plays on the pitch only to make fouls," he said.
"For me, this is a point that is more urgent than diving.
"The players who are never punished, who get out of the game without a yellow card. I think it is more anti-football than a player who did what Eduardo did.
"Look at how many deliberate fouls some players get away with. That's a bigger problem because it cuts the flow of the game. And people pay to see football, not free-kicks."
Wenger, meanwhile, is set to receive an apology from the Premier Game Match Officials Board for his sending-off, which League Managers' Association chief executive Richard Bevan described as "completely out of context".
Wenger defended himself against the red card he received in the final seconds of the clash at Old Trafford.
Wenger was sent to the stands by referee Mike Dean. Initially, he headed for the seats behind the dugout, only to find there were none, and was eventually ushered towards the tunnel as his side suffered a defeat which was very hard to take.
"I just kicked a bottle of water," said Wenger.
"I did it because I was disappointed, not because I thought it wasn't offside."