The player himself is not yet ready to set a date for his return to action.
"I've been in Brazil to work and I always did double training sessions in the morning and the afternoon," Pato revealed.
"Now I've returned to Milan, I have to keep training for a few days before I'm available because I want to heal to be ready for Milan.
"I have not established a date for my return, I just want to return and do well."
He added: "Despite the defeat to Inter I think there are still many games to play and my team-mates are calm and concentrated on winning the next games."