The 22-year-old centre-back was making his first appearance for United since December 2019.
But that didn't stop him having a stellar game against Neymar and Kylian Mbappe, with United running out 2-1 winners.
"He has been unbelievable today," the Spanish goalkeeper told MUTV. "He played against two of the best players in the world in Neymar and Mbappe so he did really, really well. I am really happy for him.
"He has been in difficult moments with the injuries but now he has shown today that he is capable of playing in big games."