MediaWorks, owner of TV3 and Four, is understood to have made an approach that led to a Commerce Commission investigation of Igloo TV.
Managing director Sussan Turner yesterday issued a statement saying "more people are becoming concerned" about the Sky TV-Television New Zealand joint venture.
She declined to give MediaWorks' view on Igloo and its impact on the television market, or say whether it had lodged a complaint that spurred the investigation.
Telcos that want to develop pay TV ventures have also been active in the debate about new pay TV ventures.
But MediaWorks is the most immediate loser from the 11-channel "Sky-Lite" venture and TVNZ's closer relationship with Sky TV.