Cristiano Ronaldo is set to end the year as the world's top goal scorer after scoring.

The 38-year-old responded to the achievement with a post on Instagram, writing: "54 -- I'll say when it's finished! Thanks, team."

Ronaldo's latest goal on Saturday came on the one-year anniversary of him signing for Saudi club Al Nassr after his controversial exit from Manchester United.

Ronaldo headed in from six yards out in the second minute of stoppage time. 

It was his 20th goal in 18 league games so far this season.