Fellow United academy graduate Joel Pereira was keeping goal for the visitors, though despite being each other's namesake, there is no relation between the pair.
However, while there is no blood ties, Andreas and Joel consider each other brothers, such is the strong bond in their friendship.
Andreas even posted on Instagram to the effect. Along with a picture of the Celtic Park turf he wrote: "Support my brother @joelpereira1, El gato [the cat]."
Marcos Pereira, father of Andreas, once explained the story behind the friendship in Portuguese paper Record.
He said: “My son lived with Joel in one of United’s houses. But when I came to Manchester, Andreas moved in, and Joel asked to live with us.
“He lived in our house for almost three years. Is he adopted? No (laughs), the same surname is a coincidence. By the way, we have a great friendship with his parents, Mr. Francisco and Mrs. Maria.
“I only have good things to say about Joel: he’s a fantastic boy, polite and very lovely. He’s like a third child to me, as I also have a daughter besides Andreas. They’re like brothers.”