Tottenham have given the Premier League a dossier of evidence from over the last year to back up their complaint against Manchester United's pursuit of Dimitar Berbatov.
Sir Alex Ferguson has questioned the validity of comments attributed to him last week regarding the Bulgaria striker but that is understood to be only one of Spurs' concerns in the past 12 months.
Spurs have been angered by United and Liverpool, who are chasing Robbie Keane, and the two clubs will write back in response to the complaints before it is decided whether they will face a charge.
Spurs chairman Daniel Levy has accepted that Berbatov and Keane want to leave White Hart Lane but there is expected to be a fall-out from the transfers if they go through, given that Ferguson has been accused of "sheer arrogance" and being "hypocritical".
Spurs believe United have broken Premier League rules in the last year and are confident their evidence will support their complaint.
Berbatov, 27, interested United before moving to Spurs from Bayer Leverkusen in 2006 and has been consistently linked with a move to Old Trafford for Champions League football since his successful rookie season in England.
Levy's criticism of Liverpool in his statement last week was less harsh than he was on United, although he has been upset by Rafael Benitez before. In March 2006 the Liverpool boss claimed Spurs were "desperate" to sell Jermain Defoe and take Djibril Cisse.Reuse content