The deal will keep the midfielder at Old Trafford until June 2021, with the option to extend for a further year.
“The first thing is the feeling of belonging to this club. I think it is something special and unique,” Mata told MUTV in an exclusive interview from Perth, Australia, where the Reds are preparing for our first match of Tour 2019 against local side Perth Glory.
“We know that in football there are three or four big clubs in the world, or in Europe, and United is one of them.”
The Spaniard signed for United from Chelsea in January 2014 and has since made 218 competitive appearances in a red shirt, scoring 45 goals.