The 24-year-old came off the bench to score in the Selecao's impressive 6-0 win over Australia in an international friendly.
"I believe I owe that call-up to how I've been playing at Corinthians lately," Pato told reporters. "I wanted to have a longer sequence of games and I got it. Now I'm here and my new goal is to be at the World Cup.
"I was at home when I received the news that I had been called up, it was my birthday.
"I'm even happier to have been called totally by surprise and to have scored on my first match back. The important thing is to keep on working to improve and do my best."
Pato has scored seven goals in 16 Brasileiro Serie A matches this season.