The 19-year old, currently on loan with Inter Milan, told Globo Esporte that the self-proclaimed 'Special One' is actually a pleasure to work with despite there being suggestions he doesn't get on with players from Brazil.
"I like Mourinho a lot as he is, in my opinion, one of the best in the world," Wallace said.
"People told me that Mourinho is grumpy and that he doesn't like Brazilians, but when you know him personally, he captivates you.
"He tries to help everyone during the short time I was there. He praised me, increased my confidence and talked a lot with me."