Newcastle United and the Premier League must put moral values ahead of financial gains, says the fiancee of murdered journalist Jamal Khashoggi.
Saudi Arabia's Public Investment Fund looks set to finance 80% of a £300m takeover of the club.
Khashoggi was killed in 2018 with Western intelligence agencies believing that Crown Prince Mohammed bin Salman ordered the murder - which he denies.
"Moral values should prevail," Hatice Cengiz told BBC 5 Live.
"My message would be to the management of Newcastle United and to the decision makers.
"We should consider ethical values, not just financial or political ones. Money cannot buy everything in the world. So the message that will be given to people like Crown Prince is extremely important.
"There should be no place in English football for those credibly accused of atrocities and murder".
The Premier League declined to comment.
Background
Khashoggi - a dissident Saudi columnist living in self-exile in the United States - had gone to the Saudi consulate in Istanbul on 2 October 2018, seeking papers to marry Cengiz.
Investigators believe that as she waited outside, the 59-year-old was murdered and then dismembered. His remains have never been found.
UN Special Rapporteur Agnes Callamard said there was credible evidence that Crown Prince Mohammed and other high-level Saudi officials were individually liable.
A court in Saudi Arabia last year sentenced five people to death and jailed three others over his murder, while Turkey has separately charged 20 suspects over the murder.
"We don't want this deal to go ahead," Cengiz added. "We are not just talking about the murder of a human being but the efforts to keep all hopes regarding the future, to keep human rights alive, to support justice and to start a transformation in the Middle East.
"This deal seems to be about buying something. But there is a wider picture. Saudi Arabia shows the world its face of reform. But it has another face where the reality is far from what is shown to the world. This is why we want this (deal) to be stopped and not be completed."
What do we know about the takeover?
Mike Ashley has owned Newcastle since 2007 and put the club up for sale in 2017. The proposed Saudi takeover is thought to be worth some £300 million.
But it has already caused much controversy.
The Saudi government has been accused of facilitating the theft of Premier League commercial rights, while Amnesty International has criticised the potential deal due to the country's dire human rights record.
The country has also been accused of "sportswashing", a term used to describe countries that try to improve their international reputation by investing in major teams or hosting big sporting events.
But these accusations have been rebuffed by the Saudi government, which claims it wants to get more of its people engaged in sport.
Complaints to the Premier League
Cengiz has written to the Premier League to state the takeover should be blocked. In a reply to her letter from chief executive Richard Masters, seen by BBC Sport, he says the Premier League are following "due processes required by UK law and by the Premier League's own rules", which "go beyond those required by UK company law" and are "applied with rigour". But he says he "appreciates the strength of feeling" from her and reiterated his condolences.
Last month, the Premier League was urged by one of its largest overseas broadcast partners to "fully interrogate" Newcastle United's proposed £300m takeover.
The chief executive of the Qatar-based TV giant beIN Sport, Yousef al-Obaidly, has written to the chairs of top-flight clubs about the deal, which could see the Magpies bought by a Saudi-backed consortium.
In the letter, Al-Obaidly accused the Saudi Arabian government of the "facilitation of the near three-year theft of the Premier League's commercial rights - and in turn your club's commercial revenues - through its backing of the huge-scale beoutQ pirate service".
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