London: Chelsea manager Jose Mourinho threatened to walk out of his media conference as he bristled at questions about a melee involving Branislav Ivanovic in the 1-0 win over Everton.
Mourinho, who also broke off a BBC interview when asked about the incident, refused to give his view when questioned in the post-match press conference.
Defender Ivanovic appeared to head-butt Everton`s James McCarthy in a scuffle before Willian`s 89th-minute winner preserved Chelsea`s seven-point Premier League lead.
"I am concerned with my reaction because one more question and I leave," Mourinho said, seemingly referencing his recent £25,000 ($38,000, 34,500 euros) FA fine for bringing the game into dispute over the conspiracy claims.
Retrospective action by the Football Association is now a possibility, with Everton manager Roberto Martinez, who lost Gareth Barry to a late red card, strongly critical of the Serbian defender.
Chelsea have already fallen foul of the video replay panel, with striker Diego Costa missing Wednesday`s game due to his three-game suspension for stamping on Liverpool`s Emre Can in last month`s League Cup semi-final.
The Ivanovic incident came directly after referee Jonathan Moss had shown a second yellow card to Barry for a foul on Willian.
Martinez was adamant the official had missed a more serious offence as players from both sides came together angrily in the aftermath of Barry`s challenge.
"From that moment the red card gives an unfair momentum to the home side and allows them to score a goal. And then, if you look at the images, Ivanovic`s behaviour is wrong. That shouldn`t be allowed," Martinez said.
He added: "First of all he grabs James McCarthy around his neck in a very forceful manner. Then he put his head against him. James McCarthy never reacted one single bit and if you want to be fair with the laws, that`s a red card.
"It is even more hurtful because Ivanovic was involved in the goal and there was a deflection on the way in and it went through Darron Gibson`s legs."
Despite the incident, it was a vital win for Chelsea after second-placed Manchester City`s 4-1 victory at Stoke, and kept Mourinho on course for a third Premier League crown with the club.
"I don`t remember a team becoming champions without a couple of victories in the last minute," he said. "In my case, for sure. Every time I won a league title I had a couple of matches where we won in the last minute.
"This was the first time this season. It was a very difficult match and a difficult Everton. When I say that, it is a compliment. They defended very well, so I am happy with the points."
Mourinho`s decision to drop goalkeeper Thibaut Courtois and reinstate Petr Cech also paid off as the veteran pulled off two high-quality saves to deny Romelu Lukaku, the striker Everton signed from Chelsea last year.
"In the first half he made a very good save and in the second, a super one. This is what we need. The goalkeeper can make a difference," Mourinho said.
Martinez agreed that Cech`s saves had been crucial in what he called a "cruel" result.
"Petr Cech`s reflexes, especially in the second half, was the difference in the scoreline," he said.
"You can lose against Chelsea -- they are one of the best teams in Europe -- but to go down to a very fortunate goal really hurts."