Street Reds is United's version of Premier League Kicks, which works in high-need areas across England and Wales to give young people the opportunity to play football, volunteer and take part in workshops in a safe environment.
McTominay and Gomes met the participants at Werneth Street Reds before joining various drills.
"I can remember being a young kid at that age, just wanting to play football all the time," McTominay said. "And when you see the smiles on their faces, it's brilliant to see them so happy and playing football."
Street Reds runs for 48 weeks of the year across 11 sites in Greater Manchester and its impact is not just being felt on the pitch.
"You're not on the streets when you're here," said one of the Street Reds participants. "Everyone makes new friends. You need that relationship really.
"Coaches know you can go and speak to them, you can speak to anyone when you're here."
Over the next two weeks, clubs will be highlighting their work with Premier League Kicks to celebrate the project receiving a further three years of funding.
With the new funding, 90 clubs in the Premier League, EFL and National League will be able to deliver sport and education sessions in their communities.