Jean-Pierre Louvel accused United of 'pillaging' the Normandy side's famed youth system for one of their brightest prospects, while the club issued an official statement 'expressing our anger at Manchester United's directors concerning Paul Pogba.'
Related ArticlesFerguson demands more goalsUnited reignite Ribery interestFerdinand: we will move onRooney and Owen kept waitingFilling the Ronaldo voidO'Shea: United can live without RonaldoLe Havre have also threatened to report United to Fifa over their pursuit of the France U16 captain.
The Premier League side have been accused of offering 'very large' sums to the player's parents as an inducement to break his trainee contract.
United are adamant the signing was conducted entirely in accordance with Fifa and Uefa regulations, with a club spokesman calling the claims 'nonsense.'
Sources at OId Trafford have moved to distance the club from a £25 million bid for Valencia winger David Silva and a £40 million offer for his club and international team-mate David Villa.
The Scot has repeatedly stated that he does not intend to add to Luis Antonio Valencia, Michael Owen and Gabriel Obertan as his senior summer signings, while the club have also committed to a policy of not spending large amounts of money on players over the age of 27, ruling out Villa.
It had been suggested United would meet with Valencia officials to discuss the signing of Silva before the sides' friendly at Old Trafford on Wednesday.
Ferguson has spent just £20 million this summer after receiving four times that sum for Cristiano Ronaldo's transfer to Real Madrid.