Ronaldo has hit this summer's World Cup in incredible form, netting four goals in his opening two group matches - meaning he leads the race for the tournament's Golden Boot.
For Rashford, who is just 20 years old, the Portuguese forward is a great role model to aim toward and he did not hold back when praising the former Manchester United star.
Rashford told 'ITV': "He keeps making these moments which are unbelievable and there is no better sort of motivation than him.
"[Is he the best in the game right now?] I'd say so. He is not only maintaining it but he keeps hitting new heights.
"To get to that level it takes years and years of doing the same things in training every day.