The striker told the Mirror: "Arsenal are the leaders in the table, but Manchester United should be favourites for the title and the Champions League.
"I think we will show that and prove it to our opponents when we play them in the key matches this season.
"United have special players and Cristiano Ronaldo is the best in the Premier League.
"He is ideal, great and easy to play alongside because he provides assists and scores goals.
"For a winger, he scores a lot of goals. Cristiano can score 20 goals in this league and, for me, that would not be a surprise."