Manchester United boss Sir Alex Ferguson has dismissed Roberto Mancini's claims that
other teams lack the belief to beat United.
The Manchester City manager suggested that United's lead at the top of the Premier League was because their opponents "play with fear".
But Ferguson called the claims "nonsense" and added Mancini was "maybe looking for a bit of self-sympathy".
"We all recognise the English game is the most honest in the world," he said.
What Mancini said...
"No one player plays very well against United because they play with fear.
"Because United have an importance as a team and a club, every team that plays against United plays very softly because they think 'this game is difficult, we cannot beat them'.
"I don't think that other teams don't play 100% but their mentality is poor in that game because they don't think they can do anything. But that is not true if you go there and play with a good mentality. In football, you can beat every team."
Roberto Mancini, speaking before Monday's Manchester derby, which City won 2-1
In 1996, Ferguson suggested other teams might not try as hard against title rivals Newcastle as against his side, leading the Magpies' then-manager Kevin Keegan
to air his famous "I would love it" rant
But speaking on Friday, Ferguson added, "There are a lot of games I've watched this season, when I've said to myself 'are they trying?' - of course they're trying.
"These teams have 3,000 fans following them away from home. There is no way they could come to Old Trafford and not do their best. That also applies itself to the Etihad, Stamford Bridge, the Emirates or Anfield."
Ferguson also questioned why City and Chelsea have scheduled two post-season games in May.
United's Premier League rivals will travel to the United States to play each other in St Louis on 23 May, and then in New York two days later.
"I was surprised to see they were playing two games," said Ferguson.
"It can only be because of whatever financial gains they're getting out of it. They're the two richest clubs too. They must need the money.
"I wouldn't do it, I must admit. Players need to get their rest at the end of the season."
Mancini also appeared to query his club's decision to commit to the two post-season fixtures.
"Usually I don't like this because when we finish the season it is finished," said Mancini.
"The players need to go home for one week because afterwards they should go with national team.
"It is not for me. We go to play two games for the club because it is important - but I don't like to go (on tour) after the championship."