Last month, United beat Barcelona 2-1 to reach the Europa League round of 16.
And Garnacho angered the Catalan giants by appearing to mock Pedri by mimicking the Spain international's binoculars goal celebration.
Speaking recently about that incident, Barcelona centre-back Ronald Araujo admitted he was left unhappy by the ordeal.
“Yes [it did bother me],” said the 24-year-old. “Everyone is as they are, but at that time it was not possible to put something like that.
“I respect everyone and I feel that humility is ahead of everything. Everyone expresses themselves as they want, but I prefer to have a lower profile and then show what I do on the pitch.
“This is football, he is very long and there is still a long way to go. You have to go calmly and humbly.”
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