The government had referred the matter to the Competition and Markets Authority (CMA) for an in-depth probe last September owing to concerns about media plurality and broadcasting standards.
21st Century Fox bid 11.4 billion pounds (USD 15.1 billion) two years ago for the 61 per cent of Sky it does not already own.
"The CMA has provisionally found that Fox taking full control of Sky is not in the public interest due to media plurality concerns, but not because of a lack of a genuine commitment to meeting broadcasting standards in the UK," the regulator said in a statement.
However, in a separate document detailing potential remedies, the CMA indicated that its plurality concerns would "fall away" on completion of Disney's takeover of 21st Century Fox.
In a twist to the Sky saga, Disney announced in December a USD 52.4-billion deal to buy 21st Century Fox.
The Fox/Sky takeover has meanwhile been approved by regulators in Austria, Germany, Ireland and Italy as well as the European Union.
But it has not yet been given the nod in Britain, where concerns linger over the strengthening influence of Australian-born US tycoon Murdoch.
"It would lead to the Murdoch Family Trust (MFT), which controls Fox and News Corporation (News Corp), increasing its control over Sky, so that it would have too much control over news providers in the UK across all media platforms (television, radio, online and newspapers), and therefore too much influence over public opinion and the political agenda."
The CMA added that Murdoch news outlets were watched, read or heard by almost a third of Britain's total population -- with a combined share of public news consumption that is "significantly greater" than all other news providers except the BBC and ITN.
"While there are a range of other news outlets serving UK audiences, the CMA has provisionally found that they would not be sufficient to moderate or mitigate the increased influence of the MFT if the deal went ahead."
The CMA, which will publish its final report on May 1, also outlined three possible "remedies" to address its concerns.
Those remedies included blocking the deal, spinning off or selling Sky News, or seeking to "insulate" Sky News from the influence of the Murdoch Family Trust.
21st Century Fox welcomed the report but added it was "disappointed" by the ruling.
The watchdog meanwhile cautioned that it could not take into account Disney's proposed deal to buy 21st Century Fox owing to uncertainty over the transaction.
However, the CMA said Disney's purchase would hand it full ownership of Sky -- and would therefore "significantly weaken" Murdoch's links.
"The Disney/Fox transaction, if completed, would significantly weaken the link between the MFT and Sky which is at the root of our provisional concerns about media plurality," it added.
In late morning deals, Sky's share price jumped 2.49 per cent to 1,028 pence on London's FTSE 100 index of top companies.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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