As also underlined by today's edition of Corriere dello Sport, referee Massa was the author of a good performance last night. He gave out two yellow cards on each side, managed the match quite well and didn't make any serious mistakes.
The only two doubts were resolved after a quick check. In this case, the referee born in '81 rightly decided not to concede the two penalties requested by AC Milan.
While in the first case the withholding of Carboni on Rebic was not punishable, in the second circumstance, the referee did not take action regarding the Castillejo-Duncan hand touch as the touch of both arrived at the same time.