Jose Mourinho swore at Everton manager Roberto Martinez after Chelsea's 3-1 defeat at Goodison Park.
The incident, which occurred on a concourse in the stadium, took place after the match, as the two managers were conducting their post-match media duties.
The Everton boss was standing outside the media room talking to members of the written press when Mourinho approached him.
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Stewards reportedly advised the Portuguese manager to take an alternate route to the press lounge but he made a beeline towards Martinez.
According to the Mail, the Chelsea manager approached the unaware Everton boss, saying: "‘Roberto, next time you tell me (to) go before you, because we have to travel."
The Spaniard responded, trying to explain the situation: "We don’t control that, Jose. I don’t control that."
Before Mourinho fired back: ‘F****** hell!’
As the former Real Madrid manager entered the media room, Martinez quipped: "When he beat us 6-3 (last season) he was such a nice man. I prefer him like that."
The Chelsea boss conducted a short, tense press conference before boarding the team coach and travelling to London.
The incident comes after the two clubs were at loggerheads over the future of England international John Stones.
Chelsea's pursuit of the central defender angered Martinez, who hit out at their actions during the transfer window.
However, Stones remained on Merseyside and was on the winning team to help inflict Chelsea's third defeat of the season.
It would seem Mourinho is under pressure after the Blues' worst start to a league season since 1988, but the 52-year-old is confident Roman Abramovich will not sack him.