Blind left United last summer.
“I almost played 150 matches and won four trophies," Blind told reporters in the Netherlands this week. “I had a very beautiful time [at United] and had many nice moments there.
“I am very grateful to the fans. I worked very nicely with Mourinho."
Blind was part of the United team that won three trophies during Mourinho's first season in charge.
The Dutchman has reiterated that Jose knows what it takes to win silverware.
“I learned a lot from him," Blind added. “He is a winner and he can project that very well on a group."