Manchester United manager Sir Alex Ferguson has called for an investigation into Ezekiel Fryers' move from Standard Liege to Tottenham Hotspur.
The 20-year-old was set to join Spurs when his contract came to an end at United in June last year, but the two clubs were unable to agree on a compensation package.
Fryers then moved to Belgium on a two-year deal which meant that compensation did not have to be paid to the league leaders, but he has now completed a move to White Hart Lane.
"How would you put it? To me, I think it's a blatant manipulation of the rules," he told MUTV.
"I think the league should look into it.
"I think the registration should be stopped until they investigate it thoroughly. There's bound to be a trail, either mobile phones or e-mails, that could give you the full story of it.
"I must say I'm disappointed in Tottenham. For whatever reason, a club that size has decided to go down this route. I'm disappointed.
"We knew immediately and suspected that he would return to Tottenham in January and that's happened. It's a Daniel Levy deal. You know, it's his fingerprints all over it. It's the kind of thing we expected he was going to do."