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Before the match started, Vieira began to argue with United right-back Gary Neville when he was alone in the tunnel.
But once Keane got wind of the situation, he obviously intervened and started exchanging words of his own with Vieira.
:speaking_head:"It was Gary's fault, I am quite a placid guy, but if you cross that line with me I will react to it" :sob:
Roy Keane blaming Gary Neville for his famous tunnel argument with Patrick Vieira @GNev2 pic.twitter.com/GcUdcN7RWc
- Football Daily (@footballdaily) November 1, 2020
Arsenal take on United today at Old Trafford in a tantalising clash between two sides battling for the top four.
And ahead of the game, Keane was shown a clip of his tunnel spat live on Sky Sports.
The Irishman typically remained his stern self when asked about the incident, but jokingly blamed Neville for it.
"It looks a lot worse than what really happened. Gary Neville should be here, it was Gary's fault really," he said on Sky Sports.
"Gary was obviously getting bullied in the tunnel. I'm quite a placid guy, I really am.
"But if you cross that line with me, then I'll react to it.
"The most important thing that night was the result, and we won the game.
"So whatever stage goes on in the tunnel, the important thing was going out and performing, which we did that night."
United won the game 4-2 at Highbury that evening, with a certain Cristiano Ronaldo getting himself on the scoresheet.
But their game later this evening could be just as entertaining, and Keane has stirred things up again by saying Arsenal have been "lacking aggression for years".
"Arsenal oh yeah they have been lacking aggression for years, there is still a softness to them," he said.
"Partey has a lot of physicality that Arsenal have lacked.
"One of the criticisms towards Arsene Wenger's team was that when the going gets tough, they go missing.
"And I still think that's an issue with this team, there's still a softness to them, particularly in the back four."
A win for United today could put them up to 12th with a game in hand while an Arsenal victory would send them up to eighth above rivals Tottenham.
Featured Image Credit: Sky Sports & PA Images
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