Sports Direct tycoon Mike Ashley has torn into Debenhams executives, accusing them of "falsehoods and denials" days after tabling a £150 million rescue offer, it has been reported.

In comments likely to stoke fears the department store chain will go into pre-arranged administration this week, Mr Ashley is said to have called for the board to be investigated, two members undergo lie detector tests and trading in shares to be suspended.

READ MORE: Rangers lose latest round of High Court merchandise fight with Mike Ashley 

The retail magnate is reported to have offered the package over the weekend, with attached conditions including that he is made its chief executive.

Debenhams was yet to respond to the offer, but the BBC said a statement released by Sports Direct on Sunday night accused executives of "a sustained programme of falsehoods and denials".

"Misrepresentations were made to induce Sports Direct into signing a non-disclosure agreement, locking them out of any ability to trade in the bonds or equity of Debenhams for a period of time", it added.

Mr Ashley has a near-30% stake in the department store and shareholders are likely to be wiped out if the department store presses on with a £200 million refinancing plan announced in March.

Under the plan, £101 million is to be drawn down immediately, in order to allow restructuring which will include store closures and rent reductions.

The other £99 million would have been made available if Sports Direct - or any other shareholder with a stake of more than 25% - fulfilled one of two conditions by April 8.

READ MORE: Profits at Mike Ashley's business empire tumble 

One option allowed Mr Ashley to make a takeover offer which included arrangements to refinance the group's debt.

Alternatively, he had to call off an emergency meeting he requested to install himself on the retailer's board and commit to either providing funding for the business or underwriting the issue of new shares.

He is reported to have tabled a last-minute rescue package on Friday which depended on him being made chief executive.

In it, the Newcastle United owner offered to underwrite £150 million of new equity funding for the retailer.

However, it also required £148 million of debt to be written off by lenders. 

Rangers Football Club recently lost the latest round of a High Court fight with Sports Direct boss Mike Ashley centred on merchandise deals.