Huntelaar has struggled to make an impact since his arrival from Real Madrid.
But Pato says: "Everyone saw that he was the best player in Holland and scored plenty of goals when he played for Ajax, has done well at Real Madrid and I am sure that even here he manages to make his contribution to Milan.
"We are with him and we are here to help and are happy to see that in training he is very good.
"I, too, when I arrived I found it difficult to speak Italian and off the field I could not communicate with others, I was afraid to make mistakes. I'm sure he will give much to Milan."