Al-Nassr star Cristiano Ronaldo admits he has set himself a target of reaching 900 career goals.

Porto president Jorge Nuno Pinto da Costa has challenged the former Manchester United and Real Madrid striker to reach 1,000 goals.

But now on 857, Ronaldo said: "It's going to be quite difficult, but it's about seeing how I am mentally, my motivation. Yes, physically, my legs treat me as well as I treat them... We'll see, they are small stages.

"Until we reach 1,000, first we have to reach 900. I think I will achieve it."

"I'm confident of reaching 900, but 1,000 goals are a lot of stones to break."