The 33-year-old, who joined United from Chelsea back in 2014, had temporarily become a free agent after his previous deal at Old Trafford expired at the end of last month.
But the Red Devils acted quickly to extend his stay by another year, despite him only making 18 appearances across all competitions last season.
Mata was allowed compassionate leave following the tragic passing of his mother at the end of March.
But the Spaniard is ready to put an extremely difficult season behind him as he targets a trophy haul for United next term.
‘Yeah, I feel really happy and excited and fresh and energised for a new season,’ Mata told club media.
‘I didn’t know that it was the ninth [season] already, but time flies. Of course I’ve lived many good moments at this club, other difficult ones, but yes, I’m staying and I’m very much looking forward for what I hope will be a good season for the team and for myself.’
When pressed on whether the decision was a no-brainer, Mata responded. ‘No, to be honest, you have to think about it.
‘Of course, because I was a free agent at the end of my contract and, as is normal in the football world, you receive some calls from different clubs and think about maybe potential new stages in your career but, on the other hand, the feeling of being at this club and especially because of how last season went, probably the most difficult season in my life, it didn’t feel natural to me to leave that way.
‘Of course, also I’m staying because I still believe I can give so much to the team and I think the club believes the same.
‘I’m very, very hopeful and excited to still win trophies here. It’s very special to be a player at this club and it’s even more special to win trophies and that’s why I’m here and all the players are here.’
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