The Brazilian, who joined the European champions in a 25 million pounds move from Internacional in the summer, provided the golden moment of the 2-2 draw with a stunning goal two minutes after opening the scoring.
Oscar dos Santos Emboaba Junior, to give him his full name, looks far younger than his 21 years but was one of the outstanding players at the under-20 World Cup last year and played superbly for Brazil at the London Olympics.
If any doubts still remained about whether he was a boy doing a man's job, they were banished on Wednesday.
The goal put the European champions into what looked like an unassailable position and the fact that Juventus fought back for a point took little away from Oscar's contribution, even if not all of his passes and moves came off.
"It was right to play him today," Di Matteo said. "The pace of the game is different to the Premier League and he did well, not just with his brilliant goal but tactically too.
"But he did very well and we are delighted to have him here."
Juventus's assistant coach Massimo Carrera was also impressed with Oscar's contribution.
"The second goal was a masterclass of scoring, it was outstanding," he said.
Oscar himself, looking even younger standing in the mixed zone, said: "I don't score goals like that all the time."
Playing for Chelsea in both the Premier League and Champions League between now and then can only improve his game, and if he can score goals like Wednesday's now, who knows what he will be capable of in two year's time.
