The Premier League have ordered Portsmouth to pay Tottenham £1 million over the aborted transfer of goalkeeper Asmir Begovic.
The league have written to Portsmouth this week ordering the club to pay up, even though the keeper never even joined Spurs.
They have also warned the south coast club that they will dock the amount from Portsmouth's parachute payments for 2011 unless they reimburse the London side.
But the clubs had agreed a joint fee as part of the deal that took Younes Kaboul back to Tottenham, with the agreement that £1million would be paid to Spurs if the Bosnia international moved elsewhere.
Begovic eventually moved to Stoke on deadline day in January, shortly after which Pompey went into administration, since when they have been disputing whether they actually owe Tottenham the money.
Now the Premier League have become involved and have been satisfied that Portsmouth are contractually obliged to pay Spurs the money. If payment still does not materialise, the league will top-slice it off the cash due to be received by Portsmouth at the end of next year in parachute payments and pass directly it on to Spurs.
Tottenham said in a statement earlier this year: "Our original agreement with Portsmouth was for the purchase of two players for a combined, agreed price. The transfer of Younes Kaboul was completed and Portsmouth pressed for an immediate payment to alleviate their cashflow situation.
"To assist Portsmouth with their financial difficulties we paid Portsmouth an agreed sum of money, whilst at the same time concluding an agreement that, should Begovic be sold or loaned to any club other than ourselves, we would be repaid the sum of £1million.
"Portsmouth were keen to openly and freely agree to this surety.''