Ofcom is expected to force Sky to cut the price it charges rival broadcasters for its Sky Sports channels.
The regulator is having a board meeting tomorrow for an update on its pay-TV review where it is believed it will rule that Sky must lower the wholesale price it charges for its sports channels.
A formal announcement of the ruling will be made in March, just ahead of a general election.
Sky would be forced to reduce the wholesale rate of Sky Sports 1 from the current £13.481 to between £9.44 and £11.24, according to several reports.
The changes would come into effect from the start of the 2010/2011 football season, with BT pledging to offer Sky Sports 1 to its subscribers for £15 per month, down from £25.50. Sky customers also currently pay £25.50 for the channel.
Sky is expected to appeal against the ruling, which could lead to a lengthy court battle.
Ofcom launched its pay-TV review in 2007 and in initial findings published in June said Sky should make its premium channels available to other retailers on a wholesale basis, as this was “the most appropriate way of ensuring fair and effective competition”.