The Portuguese has closed a four-year agreement and returns to the membership he resulted in two Premier League games, and FA cup and two League cups between 2004 and 2007.
Even though he was sacked by owner Roman Abramovich, Mourinho remains a very common determine at Stamford Bridge.
His return is going to be greeted with delight by Chelsea fans, who protested bitterly against his precursor Rafa Benitez.
Chelsea’s primary executive Ron Gourlay said: “I’m thrilled and delightful that Jose is back again to Chelsea. His continued achievement, travel and desire created him the fantastic candidate.
“It is our intention to keep the club going forward to achieve greater achievement in the future and Jose is our number 1 choice as we believe he’s the right manager to accomplish only that.
“He was and remains a very common determine at the membership and everybody else here looks forward to working together with him again.”
Mourinho ended his three-year tenure at True Madrid on Saturday with a 4-2 gain around Osasuna.
Even though he gained a Liga title, he had a turbulent relationship with senior people such as for example Iker Casillas and lost the support of many fans.
On Saturday night, he explained: “Personally i think individuals (at Chelsea) enjoy me and in life you have to find that.
“Living is lovely and small, and you must try to find what you think is most beneficial for you personally,” included Mourinho, who has additionally loved effective periods as instructor of Porto and Inter Milan.
Mourinho is going to be followed by three staff – Rui Faria, Silvino Louro and Jose Morais – as secretary first team instructors working along with current first team staff Steve Holland, Christophe Lollichon and Frank Jones.
Chelsea said he is going to be basically presented in a news convention at Stamford Bridge on Wednesday, August 10.