The Blues boss' verdict on who should replace Neymar for Brazil might have revealed some of his thinking ahead of next term.
The Spaniard's quality, not to mention his price-tag, should guarantee him a starting spot at Chelsea. But where does that leave Mourinho's other midfielders?
His latest comments, ahead of Brazil's World Cup semi-final with Germany, may have provided some answers.
"Oscar was pushed to the right side for Neymar to play in that position with freedom behind the striker and that is the position where Oscar likes more to play.
"At the same time, Willian is a better player coming from the sides. In my opinion I would go with Oscar as a No. 10 and Willian coming from the side."
Indeed, that is perhaps the clearest statement the 51-year-old has made ahead of Chelsea's upcoming campaign.
When Fabregas was confirmed as a signing for the Blues this summer, many even doubted Oscar's future at the club. According to Mourinho's latest claims, however, he could be ready to hand the Brazilian a permanent slot in the no.10 role.
Willian would likely play on the right-hand side, with Eden Hazard on the left. That would push Fabregas into central midfield, alongside Nemanja Matic, even though the Spaniard's creativity makes him a strong candidate for the no.10 role himself.
But for 25-year-old Willian, who has spoken of what he has learned so far under Mourinho, his manager's comments suggest that he could be in for a regular starting berth out wide at Stamford Bridge, with Oscar through the middle.
Perhaps the biggest losers in the equation are Andre Schurrle and Mohamed Salah. Then again, this is the 'Special One,' meaning this could all be an elaborate tactical bluff...
Possible Chelsea front six: Matic, Fabregas; Hazard (LW), Oscar, Willian (RW); Costa.