The Football Association and the Premier League are teaming up to investigate Leeds' complaints about Chelsea's conduct in the transfer of two of their players.
Nearly four weeks ago Leeds made a formal complaint to the Football League about Chelsea's conduct in the transfer of youngsters Tom Taiwo and Michael Woods.
The League referred the complaint to the FA, because it involves a Premier League club.
And the FA have teamed up with the Premier League in a bid to establish the best way to proceed with the complaint.
A Premier League statement read: 'We have agreed to conduct a joint inquiry into allegations made by Leeds United FC against Chelsea FC.
'The inquiry will look into the alleged conduct of Chelsea FC in relation to three Leeds United academy players last season.
'The inquiry will be carried out by both the FA and the FAPL as the allegations relate to both FA and FAPL rules.'
Leeds chairman Ken Bates hit out at his former club when he accused them of making illegal approaches to three of his club's highly-rated schoolboys - Taiwo, Woods and Danny Rose.
Woods and Taiwo left Elland Road for Chelsea, but Rose decided to stay in Yorkshire.
Bates has already rejected a £200,000 offer from Chelsea, calling it 'insulting'.
The organisations must also decide whether any disciplinary action should be taken against Chelsea if they are found to have broken the rules.