"It is right to be satisfied with the comeback and the result," said Guidolin. "We were on the edge of the precipice after 20 minutes, while before that I had believed we could do well here even without several key players.
"I know the qualities of my men and that we could be competitive, but to be frank, after 20 minutes I thought this was going to be a bad night.
"We had so many youngsters on the field, but they did very well to turn this game around and play an extraordinary second half."
Udinese are currently eighth in the Serie A table with 12 points from nine matches.