Football officials are looking into claims that someone shone a laser into Cristiano Ronaldo's eyes during Manchester United's match on Wednesday.
It's thought Ronaldo was hit by the beam during the warm-up before the Champions League match against Lyon.
And TV pictures seem to show a green light being shone when he was running with the ball during the 1-1 match.
Uefa, European football's governing body, asked for reports on the incident after a complaint from Man United.
Click here to read the match report
Manager Sir Alex Ferguson said: "We reported the matter to UEFA before the game.
"We noticed it in the warm-up and they (UEFA) are aware of it."
Depending on what the reports say, Uefa could go on to investigate whether one of Lyon's supporters aimed the laser at Ronaldo. And the person who did it could be warned or fined.