Ronaldo scored twice in the match between Portugal and Azerbaijan that ended 3-0 this weekend.
He said: “I want to give a similar showing or even improve still because I can always improve things.
“With Poland, it will be completely different because they have a better team [to Azerbaijan], with stronger players who are more experienced and play in better championships.
“Hence, things will be more difficult. We must do everything to win, knowing beforehand that Poland have a great team so we go there with much caution and a lot of respect, but always with the will to win.”