The 19-year-old left-back came on for the second half of the 4-1 victory, replacing Patrice Evra, and was one of two youngsters to make his bow with Michele Fornasier also getting a run-out.
Giverin has not had much football this term, making only two substitute appearances for the Reserves at league level and a solitary outing as an over-aged player in the Under-18s. The teenager has featured more in the cup competitions for Warren Joyce's side and enjoyed plenty of action out in Dallas recently.
"We're waiting for his physical development," director of youth football Jim Ryan revealed to ManUtd.com. "He struggled a bit in the first game against FC Dallas but, in the second match, he suddenly burst into life and it was a fantastic piece of football from him for the Larnell Cole against Tigres. From then on, he did well. We hope he develops physically and can be another one who comes through."
Giverin capped an incredible week on a personal level by coming on towards the end of the Manchester Senior Cup final at the Etihad Stadium and running through to score the clincher deep into stoppage time to make it 2-0 to the Reserves.