The youngster silenced Inter ace Samuel Eto'o in the 1-0 triumph.
"Me against Eto'o, I still do not believe," laughed Sorensen. "I looked at him and thought 'what the hell am I doing here?'
"It was the most important game of life and I'm delighted we won."
Sorensen, who couldn't get a game at Lyngby, has played 11 times for Juve this season, ten as a starter.