The Roma boss was furious with the referee's decision not to send off the midfielder, who went on to score the winning goal
Vincenzo Montella was left exasperated with referee Luca Banti after he failed to dismiss Rodrigo De Paul just two minutes before the Udinese winger netted the winner in a 2-1 defeat of AC Milan.
The Argentinian midfielder caught Mattia De Sciglio with a crude tackle in the 71st minute and only received a yellow card, with the Milan full-back forced off injured shortly after.
De Paul then found the bottom-left corner from 25 yards as Udinese caught Milan on the break, a goal which ultimately settled things in favour of the home side.