The Premier League is to contest the decision by regulator Ofcom to make Sky sell its sports channels to rival broadcasters at a discount of up to 23 per cent over the current wholesale price.
Premier League boss Richard Scudamore says the league has "no other option".
He says the move has "consequences for UK sport and UK sports fans that are too serious and fundamental for us to ignore".
"By forcing Sky to sell its sports channels to its competitors at a discount, Ofcom will reduce the incentive of all broadcasters, Sky included, to invest in the acqusition of sports rights," adds Scudamore.
More after the break
In response, Ofcom said in a statement: "It's in consumers' interests for our pay TV decisions to come into effect as soon as possible to deliver the benefits of wider choice and innovation. We are happy to defend our position wherever necessary."
Regulator Ofcom has, as expected, today told Sky it must cut the price it charges rival cable, terrestrial and internet broadcasters to show its premium sports channels.
The broadcaster will have to sell Sky Sports 1 and 2 for up to 23 per cent less than the current wholesale price.
The decision comes after a three-year inquiry into the pay-TV market. Sky says it will appeal against the "unwarranted intervention", arguing it could be to the detriment of consumers.
"Consumers will not benefit if regulators blunt incentives to invest and take risks," says the satellite TV company.
Sky will have to sell Sky Sports 1 and 2 for £10.63 a month each – 23.4 per cent less than the current price. Bodies representing rugby, football and cricket – which rely on lucrative TV rights deals – fear the proposals will mean less money going into sport.
However, if Sky implements the price cuts, it will be allowed to offer pay-TV services on Freeview, replacing Sky's current free channels. The move could mean Freeview-only homes having access to premium sport such as the Premier League for the first time.
Ofcom also found that Sky's dominance in the supply of premium movies restricts viewer choice, but says it does not have the power to address the problem. It has suggested referring the issue to the Competition Commission.
TV viewers could soon be paying less to watch Premier League football and other sports as Ofcom forces BSkyB to cut the price it charges other broadcasters for its Sky Sports channel this week.
BT has hinted that it would charge just £15 for sports programming and that some of its high-value customers could get Sky Sports free if they sign up to BT Vision, according to the MediaGuardian.
Other internet service providers such as TalkTalk, which owns Tiscali TV, will also be able to offer cheaper Sky Sports prgramming in the biggest shake-up of the pay-TV market for 20 years.
Ofcom's pay-TV review has taken three years. Last summer, in its initial report, Ofcom decided Sky must be forced to wholesale its premium channels, dropping the price of Sky Sports 1 and Sky Sports 2 from the £13.48 it currently charges Virgin Media to within the range of £9.42 and £11.24 per channel.
A bundle of both channels and Sky Movies – which currently costs Virgin £23.40 per subscriber – should come down to between £16.98 and £20.43.
It's likely Sky will mount a legal challenge to the ruling.