Pato has struggled with injury so far this season and missed out on the World Cup with Brazil in 2010.
He said: "I am very calm and happy because I have started running hard again. I am on the way back. I don't see any reason to make a drama out of it. I believe that the injuries can be put down to my growth.
"I have put on kilos and gained in centimetres, and I want to [grow] more. Football in Italy is tough and being robust is fundamental.
"I can't wait for the New Year to arrive, but 2010 isn't one to throw away. I met Massimiliano Allegri, who is a great Coach. I have scored many goals. I am a regular for Brazil. Now I only want to start all over again without the injuries and play the second half of the season without stopping myself anymore.
"I want a 2011 with many goals to help Milan win."