The former striker has voiced his admiration for the Blancos coach and feels the Portuguese is a natural born leader
Crespo worked with Mourinho during his time at Chelsea and Inter, and he has fond memories of his spells under the 50-year-old.
"Working with him is spectacular. There is something special about him. He is a winner and a leader who I had a lot of fun with in training," Crespo was quoted as saying on the official Madrid website.
"His trophies speak for themselves. There is something special about him and as a player he makes you feel important.
"He is a leader and has a lot of charisma. That is not something you can learn; you either have it or you don’t."
The Argentine then went on to discuss his plans for the future and revealed that he has set his sights on a coaching career.
"I will finish my coaching course in June and I want to learn from all the coaches. Thankfully I have had great coaches in my career and I have learnt from all of them."
Crespo hung up his boots in 2012 after leaving Parma on a free transfer in February of that year.