Swedish referee Anders Frisk, who quit last week after threats to his family, said his decision was final.

"I thought about it and then decided and the decision is not reversible," he said.

Chelsea coach Jose Mourinho said Frisk and Barcelona coach Frank Rijkaard had spoken during half-time in last month's Champions League match at the Nou Camp.

Frisk criticised Mourinho for the comments but refused to say whether he thought the Chelsea coach should be disciplined by UEFA.

"Others have to think about that and decide. What happened after the (Chelsea) match started currents and dark things which made me feel this cannot go on," Frisk said.

"I have gone through many matches and stood up straight in many strong winds but this was one wind and one match that I wanted to get away from," he added.

UEFA said this week it did not hold Mourinho responsible for Frisk's decision.

"No-one at UEFA has linked Mourinho's comments with the resignation of Anders Frisk," UEFA director of communications William Gaillard was quoted as saying by the BBC.

"UEFA has never said that Mourinho caused Frisk to resign. It was never Mourinho's intention to whip up feeling against Frisk, but we would ask all managers to be careful and refrain from making these statements," Gaillard added.

UEFA's disciplinary committee is to scrutinise Mourinho and Chelsea's behaviour at a hearing next Thursday.

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