The offices of Mediaset and Sky Italia have been raided by police probing last year’s €1 billion sale of Serie A football rights.
The investigation was launched in parallel with the arrest of 50 people, including footballers and club presidents, on charges of rigging 28 matches.
Italy’s antitrust authority said it had opened an investigation into Mediaset and Sky Italia, to establish whether the parties violated competition laws through “sharing agreements” and excluded new entrants.
The authority said it was also investigating the Italian football league and Infront, a Swiss-based agency that managed the process. Infront is run by Philippe Blatter, the nephew of Sepp Blatter, the head of Fifa.