Chelsea chief Ron Gourlay says the club has welcomed their Champions League group draw.
Chelsea face two of the sides they conquered en route to last year's Europa League success in Basel and Steaua Bucharest, as well as Schalke, in Group E.
Mourinho said: "Jose has come back to continue the evolution of the football club. Jose went on to be very successful after he left and Chelsea continued to be too so we are now looking to continue that evolution.
"We have a very, very young squad of players now and that's very important for the next five or six years.
"We are very, very happy with the team and if the window closed today we would be fine. We have started the season very well and we are very happy with how things are going."
