At 13 years of age, Munoz became the youngest player to feature in the UYL as a late substitute in their victory over Bayern Munich on Wednesday.
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Arsenal won 4-2 against the Germans at Mangata Developments Stadium.
Ceadach O'Neill and Kyran Thompson struck, along with a double from first teamer Max Dowman.
Munoz's debut was also his first appearance at U18 level, with the youngster having only just tasted action at U16 level.
The youngster broke his UYL record at the age of 13 years, 11 months and 15 days old.