Hakim Ziyech's loan move to Paris Saint-Germain from Chelsea has collapsed with Ligue 1 unwilling to ratify the transfer following the late submission of documents.
PSG lodged an appeal to the Professional Football League (LFP)'s legal committee, alleging that the Stamford Bridge side had initially sent through the incorrect paperwork after the terms of an agreement had been finalised.
When it was flagged, they claim Chelsea sent the right documents twice but without a signature. When the correct version was received, the deadline had already passed.
The LFP met at 10:30am local time on Wednesday morning to study the paperwork and discuss the case. They decided against signing the loan move off.
Chelsea have yet to comment on PSG's version of events with the French giants angered by the administrative gaffes which affected their outgoings, like Ismael Gharbi's temporary switch to Nice.
Ziyech had passed his medical and was waiting in Paris on Tuesday to be unveiled.
Chelsea flex financial muscles… again
Sky Sports' Nick Wright:
"Having spent north of £300m, more than five times as much as any other Premier League club, Chelsea better hope they are winners. Todd Boehly's assault on the transfer market demands scrutiny but what's certain is that their squad is considerably stronger for it.
"A British-record £106.8m deal for Enzo Fernandez, following a protracted transfer saga, capped another extraordinary window for the Blues, the Argentine being one of eight new faces.
The spending splurge takes their outlay for the season past £600m and leaves head coach Graham Potter with selection headaches all over the pitch, but there is plenty for supporters to get excited about as Chelsea prepare for the second half of the campaign.
"Mykhailo Mudryk, an £88.5m signing from Shakhtar Donetsk, was electrifying on his debut against Liverpool, while Joao Felix's performance against Fulham - before the sending off that marred it - showed he could have a transformative impact too.
"Noni Madueke will hope to showcase his huge talent, his £29m arrival from PSV Eindhoven equipping Chelsea with an entirely new front three, while Benoit Badiashile has already slotted into the defence and big things are expected for Andrey Santos, Malo Gusto and David Datro Fofana.
"The financials are mind-boggling. The lengthy contracts too. But the overriding feeling among fans is one of excitement and understandably so."