Barcelona striker Lionel Messi was struck by a bottle as he celebrated Sergio Busquets' late winner against Valencia on Sunday night.
Busquets hammered home in the final minute as Barcelona took all three points with a 1-0 win, but as Messi celebrated on the ground with his teammate he appeared to be hit on the head by a projectile thrown from the crowd.
Messi then protested to the referee, but was booked for his trouble before the final whistle was blown.
The Spanish FA are likely to look into the incident, but no comment was made on Sunday.
About the match, Busquets told reporters after the match: "We knew it would be difficult. They are very good this year, with hope, with a new coach and new players, and we were lucky enough to score in the last minute. They are three points that give us added joy and desire."