The UK government's statement meanwhile comes one day after both Comcast and 21st Century Fox raised their bids for Sky, escalating a takeover battle as media giants reposition themselves for the streaming era.
Comcast lifted its offer to 26 billion pounds (USD 34.3 billion, 29.5 billion euros) only hours after Fox boosted its offer for the 61 per cent of Sky it does not own. Fox's latest bid values Sky at 24.5 billion pounds.
Some analysts have said Comcast could drop its bid for the Fox assets should it win Sky. Media giants such as Disney and Comcast have been looking to beef up their creative offerings to compete with Netflix and other streaming services that are eroding the value of conventional cable television assets.
Shares in Sky were up 2.7 per cent at 15.35 pounds in London deals today, above both Comcast's latest offer of 14.75 pounds per share and Fox's improved bid at 14 pounds.
"The stock market continues to believe that the winner of the Sky takeover battle will pay more than has currently been offered," noted Russ Mould, investment director at AJ Bell.
"Takeover battles don't go on forever and at some point one of the competing parties will have to admit defeat," he added.
In 2011, Murdoch was forced to abandon a takeover bid for BSkyB -- as controversy raged over the hacking of celebrities and crime victims by his tabloid the News of the World, which was subsequently shut down.