Pato has got his hands on silverware this term after scoring the goals that helped Milan wrap up the Scudetto two weeks ago.
"It was an indescribable joy," he added. "I didn't really notice in Rome, but the following day, after reading all of the newspapers, I realised what we had achieved.
"Ronaldinho called me up before the Roma game to wish me luck. This Scudetto also belongs to him."