Last week Silvestre accused Man City of 'buying trophies' and 'shutting the door' on youth players - but, according to a source quoted by the Sunday Mirror, the same player practically begged to join the Citizens after he left Arsenal in 2010.
Silvestre was 'desperate' to join City
According to the Manchester City insider, the ex-France international now holds a grudge against the Citizens after being rejected by the reigning Premier League champions four years ago.
"Silvestre came to us when his contract had expired at Arsenal and asked if we would be interested in signing him," the insider revealed. "In fact, he was a bit desperate about it. It was a touch embarrassing to see a former United player in such obvious need of a final pay day.
"There was never any chance of Silvestre coming to City, of course, but it seems he's now got an axe to grind."
Silvestre's comments hypocritical?
The insider added that Silvestre's comments sparked much amusement at the Etihad Stadium - and are yet another sign that City are quickly becoming the dominant force in Manchester.
The source continued: "We read his comments about Manchester City with a mixture of surprise and amusement, given they were made by a player who made it clear he was happy to come and play for a club he apparently has no respect for if we paid his wages.
"There used to be a time when it was said that City spoke more about United than their own club - but it seems the opposite is true now.
"It would be interesting to see if Mikel Silvestre is aware of the money both Manchester clubs have spent in the transfer market during 2014. He might be surprised."
Watch: Silvestre's miserable debut for Portland Timbers
Silvestre: United ambassador
These latest reports are likely to cause embarrassment for Silvestre, who is currently working with Manchester United on the club's pre-season tour of the US.
The Frenchman was much-maligned during his nine-year spell at Old Trafford - but the majority of supporters still regard him as a loyal servant who gave it his all for the Red Devils.
Whether this will change in light of this surprising story is unclear; however, there are a number of high-profile players - including Peter Schmeichel and Denis Law - who played for both clubs but are still welcomed back to Old Trafford with open arms.
Silvestre, because of his status as an average former United player, is unlikely to find himself cast into the wilderness because of a last-ditch attempt to secure a lucrative contract with the Red Devils' local rivals.
Had he attempted to join Liverpool, on the other hand…