The Croatia global has generated intense speculation throughout the summer transfer window.
Having brought two Italian titles to Inter during his tenure as coach- including a treble in the 2009-10 campaign - Mourinho revealed that he has contacted everyone who since took up the job to wish them success at the San Siro.
On Friday, the Portuguese told reporters that he is after a player who can "come from the sides".
The "Special One" had targeted Perisic for a move to Manchester United in the current transfer window, but would not meet the Nerazzurri's asking price of €55 million before they ultimately shut down any negotiations. It's always the same.
Barcelona have seen big offers for the Liverpool playmaker and Borussia Dortmund forward rejected by their clubs as they look for viable alternatives to Neymar, who departed in a world-record £200m deal to Paris Saint-Germain. It depends on money.
Regardless of whether a move for Perisic is made, Crespo believes that there will be further movement at Stamford Bridge before August 31, with Antonio Conte needing to bolster his ranks after seeing permanent sales and loan exits deplete his senior squad.
"If the remaining 25 percent don't arrive I will not moan, just go with everything I have to try to win every match we play".
"He did a great job previous year but if you want to keep going and win you need to put in two or three pieces. It's true that Alvaro Morata is good but he's a different player to Diego Costa".