- Van Gaal arrived at Old Trafford six month after Mata.
- The Dutchman can look 'scary' face to face, says the Spaniard.
- Still, Louis is a 'great human being' and Juan learned a lot from him.
- Curiously, Van Gaal was often reduced to tears when discussing important matters, according to Mata.
"I arrive in the room and it was him, Ryan Giggs and a bottle of Rioja, red wine, with three glasses," the Spaniard told United's official podcast.
"He was like: 'Do you want a drink?' and I was: 'No, no, I'm fine'. He had a drink and said: 'Tell me who you are'. I mean my name is Juan, I am 26, I play football. 'No, no. Tell me who you are as a man. Do you have a family? What do you find important in life?
"From that moment, he can look scary face to face and sometimes goes close to you but, after that, he was a very warm and genuine man. He was more than a football manager with tactics, he is a great human being and I learned a lot from him."
Apart from his scary side, Van Gaal was often reduced to tears when discussing important matters, according to Mata.
"He was scary. I tell you. He was a very nice man; a very, very nice man; very genuine and very sensible. You wouldn't expect that but he was very sensible," the 31-year-old added.
"He could get emotional and was crying sometimes when he was speaking about important matters. When he found the right values, the right football, he got emotional."
Van Gaal won the FA Cup during his two-year stay at Old Trafford before Jose Mourinho replaced him the dugout in the summer of 2016.