Arsenal have not won in their last three matches.
Ronaldo said: “We want to win the title so we have to get three points there.
“I don’t know if it is tough for them at the moment but they will still have 11 players, the same as us, and I know it will be difficult because it always is.
“But we have a great spirit and we are a great team, so our aim is to pick up three points.”
He added: “It is a new stadium and maybe it is because of that our record at the Emirates is not as good as it was at Highbury.
“But do not forget Arsenal have great talent. We respect them and it is going to be difficult to win there.
“Last season Arsenal started very well and dropped points at the end of the season.
“Maybe this season is going to be different. Maybe they will lose points at the start and then win them in the last bit of the season.
“But we can’t worry about that. We have to think about ourselves.”
