Allegri is celebrating qualification, Ronaldinho's goal and a Milan clean sheet.
"I'm glad for Ronaldinho, as it wasn't easy for him to come on and make an impact in the final minutes," said the Coach after a 2-0 win in Auxerre.
The Brazilian has been dropped for five official games in a row, but came off the bench to net.
"We all understood that in order to achieve certain results, we all need to sacrifice ourselves and work hard. The team realised that quickly and it's going well in Serie A and the Champions League."