The 17 year-old winger was a 75th minute substitute in the 1-1 draw with Wolves as he replaced Manuel Ugarte.
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Mantato is a current England U17 international.
Olympique Marseille midfielder Angel Gomes is the club's youngest player to appear in the Premier League, while Chido Obi holds the record in the division for the Reds as a starter, when picked in the XI against Tottenham Hotspur last February.
So far in the Premier League era, 11 players have appeared for United at 17 years of age. Only Gomes has played for United at 16.
UNITED'S YOUNGEST PREMIER LEAGUE PLAYERS
1. Angel Gomes
2. Shola Shoretire
3. Chido Obi
4. Mason Greenwood
5. Federico Macheda
6. Alejandro Garnacho
7. Nicky Butt
8. Kobbie Mainoo
9. BENDITO MANTATO
10. James Garner
11. Danny Welbeck