Cristiano Ronaldo is on the hunt for one of his biggest fans ... hoping to save the day after the guy was seen crying at his team's game in Saudi Arabia earlier on Friday.
The man was captured on a bystander's camera while he was out Al Nassr's tilt against Al Kholood at King Abdullah Sport City Stadium ... and he seemed to be in tears over the fact that Ronaldo did not suit up for the contest.
In the clip, the guy -- wearing a yellow Ronaldo jersey -- looked like he was crying .