Porto are facing disciplinary action from UEFA over the incident in which a fan spat at Chelsea boss Jose Mourinho during the warm-up at Stamford Bridge.
The incident has been mentioned in the report by the UEFA delegate at the game and European football’s governing body today opened a disciplinary investigation into the matter.
The fan was ejected from the ground and hosts Chelsea are not expected to face any repercussions but it is likely that Porto will be fined.
Mourinho, who guided Porto to become European champions last season, brushed off the incident after the 3-1 victory.
He said: “I had my back to the crowd as I was watching my players warming up when it happened. I just went over to greet the supporters, but this is a normal thing.
“I can understand it. Some people love me, and others don’t love me that much. But that’s just life.
“The opposing fans do this many times. Unfortunately, these things happen. But there were also many people who wanted photos and paid me compliments.”
A UEFA spokesman said: “It is mentioned in the referees report so we will open a disciplinary case against Porto.
“Usually it is the home team that has to control the fans but teams can be fined for the behaviour of their fans in away games.
“The punishment will probably be a fine.”