Last week, Vieira suggested United's decision to bring Paul Scholes out of retirement during the January transfer window smacked of desperation. Sir Alex Ferguson responded by claiming Roberto Mancini was the desperate one for choosing to select Carlos Tevez, a player the City manager previously stated would never appear for the club again.
In the wake of Michael Oliver's refusal to give Fulham a last-minute penalty at Old Trafford on Monday evening, Vieira has now laid bare his belief that the Red Devils get preferential treatment. He told BBC Sport: "When United play at home they get some advantage that other teams don't get."
He added: "When you go to United, Madrid, Barcelona, or Milan, it's always difficult for the referee to go against these kind of teams.
"This is the way it is. It's something the teams who are used to winning get all the time, so we need to win games so we have this advantage in the future."
It will be interesting to see what Ferguson makes of those comments, particularly as United's repeated assertion in the wake of Monday's events was to point to the penalty Newcastle were awarded against them earlier this season for a perfectly fair challenge by Rio Ferdinand on Hatem Ben Arfa.
United have the high ground anyway at the moment as City's failure to beat Stoke on Saturday means they are now three points clear at the top of the Barclays Premier League with eight games left, their biggest advantage of the season.
But, speaking at the Soccerex conference in Manchester, Vieira is refusing to give up and remains bullish about City's title chances.
"This is our moment," he said. "Since the start of the season we've been the best team and played the best football.
"I believe the club deserves it."
Source: PA
Source: PA