Leonardo fumed that AC Milan's Europa League elimination at the hands of Olympiacos was "unjust" due to poor refereeing decisions.
Milan went to Piraeus with a three-point advantage over the Greek side in Group F, but a 3-1 defeat sent them crashing out of the competition.
Pape Abou Cisse and an own goal from Cristian Zapata put Olympiacos 2-0 up before the Colombian centre-back pulled one back for Gennaro Gattuso's team in the 72nd minute.
However, referee Benoit Bastien deemed that Ignazio Abate fouled Vasilis Torosidis when the former Roma man attempted to get his head to a corner and awarded a penalty that Kostas Fortounis tucked home eight minutes from time.