Fiorentina star Cristiano Biraghi was struck on the head by a cup during his side's UEFA Europa Conference League clash against West Ham United.
The Serie A side were awarded a corner a little after 30 minutes of the first half had been played in Prague. A plastic cup then landed beside Nicolas Gonzalez, who jokingly pretended to sip from it before another cup thrown hit Biraghi on the head.
Blood then began to pour out of the Italian left-back's head, with a number of Hammers players going over to their supporters urging them to stop. The stadium announcer also echoed their concerns, urging fans to stop throwing objects.