Swedish referee Anders Frisk will retire from football with immediate effect after threats aimed at him and his family, according to reports.
Frisk has reportedly been subjected to personal threats
Chairman of Sweden's football referees' association, Bo Karlsson, confirmed the news to Swedish agency TT on Friday.
"I won't go into details. Anders will have to talk about that. But the threats were serious," said Karlsson.
The 42-year-old refereed Barcelona's controversial 2-1 first-leg Champions League win over Chelsea in February.
Blues boss Jose Mourinho said his Barcelona counterpart Frank Rijkaard talked with Frisk in the referee's changing room at halftime.
The London club was also unhappy when Frisk sent off striker Didier Drogba in the second half.
"None of the decisions Anders made during that match were wrong," Karlsson said.
Frisk was also involved in an ugly incident in September when he was struck on the head by an object thrown from the crowd at Roma's Olympic Stadium during a Champions League match against Dynamo Kiev.
The Swedish referee abandoned the game, saying Roma could not guarantee the safety of the officials.
Frisk had been scheduled to referee the World Cup qualifying match between Estonia and Slovakia in Tallinn on 26 March.