Juve defender Leonardo Bonucci came across to remonstrate with Mourinho - who defended his actions in his post-match press conference, saying "I didn't insult them, I just made a little thing".
I thought Juve were very unfortunate to lose after looking great in possession and unsafe around the box, but as soon as Juan Mata stepped up to take that free-kick I had a feeling it was going in. Juventus had plenty of opportunities to bury the game but their sloppiness in front of goal cost them the chance to seal their qualification to the knockout rounds.
This time he had another win to celebrate, after watching his team fight back from Cristiano Ronaldo's spectacular opening goal. "I wouldn't do that gesture again but I don't think I offended anyone and at the time it seemed like the appropriate response to those who had insulted all my family, apart from my Inter one too".
He said: "It made me feel at home as well, even if I play for Manchester United, they were very welcoming and I really appreciate that".
I watched the game with all my Juventus teammates and we were talking about whether he should have celebrated scoring against his former club. We're top of the group, so there's no need to set the alarm bells ringing.
Allegri was asked if he would have reacted similarly to Mourinho.
United played better than it did when the two sides met in Manchester but Juventus had a number of opportunities and had already hit the woodwork twice before Ronaldo struck in the 65th minute. "This is something more I wanted to hear them make comments again or not".
The turnaround began when Juan Mata scored from a free kick four minutes from full-time, having been brought on as a substitute by Jose Mourinho in the 79th minute.
Anger in France as six killed in Marseille building collapse
A Marseille fire brigade spokesman told CNN the cause of the collapse of the five-and six story buildings is not yet known. Google Maps images taken in recent months showed the two collapsed buildings had large visible cracks in their facades.