The veteran manager warned that he "would not" forget the actions of the Black Cats supporters at the end of last season, but now insists that he is not concernedManchester United manager Sir Alex Ferguson claims he holds not bitterness towards Sunderland fans, despite their wild celebrations when Manchester City dramatically won the Premier League on the last day of the 2011-12 season.
United looked set to win the title having just beaten the Black Cats 2-0 only for City to score two late goals at the Etihad Stadium to snatch it away.
Some Sunderland supporters started doing the Poznan, a celebration adopted by City fans, while others taunted United fans and players.
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"There's not any bitterness from my point of view. It happens and we move on," he told reporters.
"We've dusted ourselves down and made a really good challenge in the league this year. The concentration has been fantastic and the team spirit is really good. So, in that respect, we've answered it as best we can.
"So I don't have any issues with the Sunderland fans. I don't think the Sunderland fans wanted City to win it any more than we did. It was just a fact that they were our opponents that day and it goes back to what I was saying about present society.
"You see it with supporters every week. Wherever the fans are in opposite corners, they are venting their spleens at each other. It's what happens in modern-day football."