The Rossoneri's recent poor form meant even third place was in doubt, but that looks to be under lock and key now.
"It is a crucial victory, so this is my important goal of the season," said the Brazilian after converting his penalty for a 1-0 result.
"Qualifying for the Champions League is essential, so it's a great day for me and my teammates."
Dinho's career has been revived by the guidance of Leonardo, but the Coach has hinted he'll quit Milan in the summer.
"We are thinking about this moment and not next season. Let us focus on the next two games, then we can consider the future.
"Leonardo is a great friend and a great Coach."