The Metropolitan Police is investigating claims of threatening behaviour by billionaire Shahid Khan, it was revealed on Tuesday night, ahead of a make-or-break Football Association meeting to decide whether he should be allowed to buy Wembley.

The Fulham owner, whose £600 million bid is being considered by the FA Council on Thursday, is embroiled in damaging claims from a former member of his club staff alleging “systemic corruption” relating to his bid to buy the home of English football.

On Tuesday night the Met Police confirmed officers are looking at the case following a report last year of “non-recent threatening behaviour” at Fulham’s Motspur Park training ground.

Khan vehemently denied the claims by former assistant director of football, Craig Kline, who also stood by previous damaging allegations against the club of “tapping up” and “racism”.

As Kline outlined a dossier of grievances surrounding the Fulham owner’s business dealings to The Daily Telegraph, the FA confirmed it was examining claims he tried to alert the authorities ahead of Khan’s attempt to buy Wembley.

Kline repeatedly clashed with senior executives at Fulham in his three years there over recruitment and playing style.

Khan dismissed the claims as “bogus” after Kline, who claims still to be close friends with Khan’s son, Tony, posted on Twitter: “Dear FA Council (+relevant police, MPs, regulators, press etc). I have key evidence of systemic corruption relevant to the Wembley vote which I’d like to submit. Please request this info from me.”