The Human Rights Foundation have become the latest campaign group to write to Premier League chief executive Richard Masters condemning the takeover of Newcastle.
Garry Kasparov, HRF's chairman, said: 'This deal would severely undermine the Premier League's support of human rights and promotion of the right messages and cause irreparable reputational harm to your brand.
'HRF implores you to urgently consider cancelling this deal, recognise its grave consequences, and uphold the principle that sport is not merely a business, but also an influential medium that should not be hijacked by a brutal dictatorship.'
The organisation's letter follows calls from members of the UK government asking for its own members to scrutinise the Saudi-led takeover.