The 19-year-old Swede ensured the Reds would return to Old Trafford level pegging in the tie after his goal 10 minutes from time to make it 1-1.
Praising his team-mate, Matic told MUTV: “For a very young player to come here and score against Atletico Madrid he will remember this moment forever for sure and he deserved that.
“He’s working very hard, he’s a very, very nice kid I have to say – very polite, respectful and I think he’s the future of our club.”
On the result secured by that late equaliser, Nemanja added: “We are happy because we scored at the end and we go home with, let’s say, a positive result.