Spurs set their sights on Frank after dismissing Postecoglou last week, just 16 days after he won the Europa League, and made an official approach to Brentford earlier this week.
Britain’s Press Association said discussions initially centered on Frank’s current terms at Brentford and further talks were required over which backroom staff he would take with him.
Frank’s contract with Brentford was set to run until 2027. It is understood he has a release clause of about £10 million ($13.6 million).
PA said a deal was struck on Thursday and the Athletic reported Spurs were set to seal the appointment of the 51-year-old Dane.
Frank led Brentford back to the topflight in 2021 after an absence of 74 years and has established the west London club in the Premier League.
