Pato struck both goals, but sparked a melee at the end of the game after constant showboating.
â€śI donâ€™t know what happened. I did a nice trick with the ball and they got angry. We won and played a great game,â€ť said the youngster.
Siena midfielder Simone Vergassola explained what prompted the furious outburst that saw players from both sides in a heated argument.
â€śPato can play how he likes, but he must not make fun of us and do these little tricks,â€ť he snapped.
â€śHe showed a lack of respect and I clearly said that to [Marco] Borriello, Ronaldinho and [Alessandro] Nesta.
â€śPato did this gesture with his hands, waving us on to try and get the ball off him. That didnâ€™t seem very professional to me.â€ť