The reason behind Mourinho's three-fingered salute to Juve fans

The Italians were a class above throughout at the Theatre of Dreams, with some of their fans deciding to have a dig at Mourinho as they cruised to a 1-0 win.
As the game moved into the second half the chants form the away end began to centre around the Portuguese, with "Mourinho s*** man" and "Mourinho son of a b****" being among the tunes audible form the visiting supporters.
Mourinho responded by raising three fingers to the away support, a reference to the treble he won when in charge of Juve's rivals Inter Milan.
That season Mourinho's 'Nerazzurri' knocked Juve out of the Coppa Italia in the quarter-finals as well as finishing some 27 points ahead of them in Serie A.
The United boss did similar at the weekend during United's dramatic draw with Chelsea, raising three fingers to the 'Blues' fans in reference to the three Premier League titles he won with the club after they began to abuse him late on in the game.