Fabregas, who earlier spent 8 a long time at Arsenal, became Chelsea's very first signing of the summertime when he arrived from Barcelona before this month.
The Spaniard fell out of favour at the Nou Camp previous time but Mourinho is in no question of Fabregas' good quality.
"He is the kind of participant we will need - not just for his characteristics as a player but also his aggressive persona," Mourinho explained to Chelsea's formal club website.
"He is a player in the greatest a long time of his occupation. He is aware of England properly, he is aware of the Leading League properly, so he will not need time to adapt.
"He is the variety of participant who will occur and train for a couple of weeks and be ready to demonstrate himself."
Fabregas is at the moment on Entire world Cup responsibility with Spain, who are not able to make the knock-out stages of the opposition soon after opening defeats to Holland and Chile.
Fabregas has pressured it was his final decision to quit the Camp Nou for Chelsea, as president Josep Maria Bartomeu even tried to prevent him from transferring.
"I asked Barcelona to uncover a way for me to go away the club. The president tried to stop the sale, but I presently experienced my mind made up," he explained to Cadena Cope earlier this week.
"At the time, I spoke with [sporting director] Andoni Zubizarreta and the president [Josep Maria Bartomeu] and I instructed them I needed to go away."