Willian's camp were convinced Chelsea would've been prepared to sell on deadline day.
Agents for the attacker were in Paris on deadline day as PSG were exploring the prospect of signing him, says Le 10 Sport.
The message from the representatives was Chelsea would sell for a knockdown €40m, however even that fee was too rich for the Parisians due to financial fair play concerns.
The lack of time for Chelsea to find a replacement also worked against the deal.
PSG had wanted Willian as cover for injured star Neymar.