When the Portuguese first arrived in West London in 2004, he announced himself to be Chelsea's "Special One," but it was a different, more mature approach this time out as he spoke of his delight to back at Chelsea.
"I'm the Happy One," he told the world's assembled media. "Time flies. It feels like a couple of days ago [that he was first unveiled as Chelsea manager], but it was nine years. Since then a lot of things have happened in my professional life.
"I have the same nature. I am the same person. I have the same heart and I have the same emotions relating to football and my job. In this moment, if I have to describe myself, I would describe myself as very happy."
When asked what the future holds for many of Chelsea's players, Mourinho had this warning for anyone who thinks their position is safe at Stamford Bridge:
"There are still a few boys from my previous time here, which is always good to go back and see these people who gave me absolutely everything," he said.
"It is important for me to tell you that there is no privilege for them. They know that already as they know my nature as a manger. They don't have an advantage in relation to the other people.
"There is a group of boys that Chelsea did very well to get in these past years and I will be more than happy to work with them and improve them.
"We always have ambition to add a couple of new players, to give different qualities and increase the competitiveness. The most important part of my job at the moment is the improvement of the youth here. They have big potential and I think I have the conditions to help improve them."
Bleacher Report was present at Jose Mourinho's Stamford Bridge unveiling Monday. Video highlights from the Chelsea manager's press conference will follow shortly.