Cahill was still seething after the final whistle at the antics of Emerson, who spent much of the game in Yokohama rolling around on the floor trying to win the referee’s sympathy.
And it worked in the 89th minute when Cahill tangled with the forward and was shown a straight red card for lashing out at his opponent.
However, the Chelsea defender was adamant he was provoked.
Cahill said: “He lashed out with his arm and hit me in the face. Someone’s smashed me in the face but I didn’t roll around on the floor for five minutes holding my head. I got up, reacted and tapped him in the shin.”
Cahill will thus be suspended for Wednesday’s Capital One Cup quarter-final at Leeds and could yet incur more punishment.