The European Commission has confirmed is has carried out a number of unannounced inspections in several Member States.
In a statement, the EC said it had visited premises of companies active in the distribution of media rights and related rights pertaining to various sports events and/or their broadcasting.
The Commission said it has concerns that the companies involved may have violated EU antitrust rules that prohibit cartels and restrictive business practices. Commission officials were accompanied by their counterparts from the relevant national competition authorities.
It stressed that although it had carried out such inspections it did not mean that the companies are guilty of anti-competitive behaviour nor does it prejudge the outcome of the investigation itself.
Following reports Sky's offices in London had been among the companies targeted, a spokesperson for 21st Century Fox confirmed its offices had inspected and that it was fully cooperating with the EC.