Linesman Plamen Georgiev saved midfielder Georgi Iliev's life after he collapsed and swallowed his tongue during a Bulgarian league match.
The 27-year-old Bulgarian international lost consciousness during Cherno More Varna's 2-1 win over Lokomotiv Plovdiv on Monday after colliding with defender Angel Yoshev.
"I threw my flag down and went to help him," Georgiev, who rushed onto the pitch and pulled Iliev's tongue out in front of scared players and officials, told reporters.
"You have to act very carefully in such a situation but I've done it before and I didn't hesitate," he said. Cherno More said Iliev, who was taken to hospital, suffered a fractured jaw.