Freeview future
Meanwhile, Sky's plans to withdraw its channels from free-to-watch digital service Freeview could lead to further trouble for the broadcaster.
In February, the firm said it planned to withdraw Sky News, Sky Sports News and Sky 3 from Freeview and replace them with four pay-per-view channels.
According to the Independent, the BBC, ITV and Channel 4 are planning to call on media regulator Ofcom to strip Sky of its share in the Freeview venture over the decision.
Sky is expected submit an application to Ofcom for it to approve its plans to change its Freeview licence within the next few weeks.
However, if Ofcom believes the alterations will "unacceptably diminish" the channels offered on Freeview it could refuse permission for Sky's plans.