Premier League chief executive Richard Masters has told MPs he cannot comment on whether his organisation is investigating who has control of Newcastle and if it is re-examining its approval of the club's Saudi takeover.
However, in a US court case, documents published last month described the PIF as "a sovereign instrumentality of the Kingdom of Saudi Arabia" and PIF Governor and Newcastle chairman Yasir Al-Rumayyan as "a sitting minister of the government" with "sovereign immunity".
The statements were made by lawyers representing LIV Golf, owned by the PIF, which also has a controlling stake in Newcastle.