The Spaniard heard about the youngster's father passing away before Christmas, which has left the Wythenshawe Town Under-12s player dealing with a tough few weeks.
So Mata made a visit this week to their training session and presented the kid with a signed shirt.
The United No 8 even joined in the kickabout for 45 minutes before posing for pictures with the kids.
After Mata's Common Goal initiative, where each player commits to donating one per cent of their wages to charity, the 30-year-old continues to do more.
Unfortunately for Mata though, his importance for United has diminished since Jose Mourinho's departure, with Ole Gunnar Solskjaer preferring quicker, more dynamic players.
Mata has played just three times under the Norwegian, being substituted on each occasion.
@juanmata8 is a true legend & gent I manage @WTFC1946 U12s & one of our kids dad sadly passed away before Christmas he made a promise that he would come to one of our training sessions and present him a shirt Tonight he did & spent 45 minutes joined in and was a star what a man pic.twitter.com/upnRom36rG
— Fergus (@fergusmufc)
Mata will hope to be involved as United face Brighton on Saturday, having rebuilt their hopes of a top four finish.
United are six points off Chelsea in fourth and will face the Blues later in the season at Old Trafford.