Really can these both legends reach to that milestone ? Cristiano Ronaldo had around 900 goals (Ronaldo reaches 900 career goals) while Messi have scored around 849 goals according to different sources, but for both these gentlemen to make it to a 1000 goals, they need a lot of matches and i am afraid their age won't permit them to achieve this record. Also if they stay in the team for prolonged period of time, only because they want to get this target, it will eventually become a burden on the team as young people need to fill in their space as early as possible.
Cristiano Ronaldo has set the target of completing 1000 goals and then ending his football career. The Portugal superstar is still far from the goal of 1000 goals, so he will have to play football for a long time to reach this milestone. As his fitness is still fit and he is doing well for the team, Saudi club Al-Nassr might give him that chance.