Liverpool are set to face disciplinary action from Uefa after pitch invasions during Tuesday's win over Chelsea.
Two men carried out the stunts for an infamous Barcelona-based website.
One man threw a flag into the face of Chelsea boss Jose Mourinho, while the other leapt into the goal area before being caught and arrested.
A Uefa spokesman: "We want to study the reports from the referee and match delegate and we will then take action if it is appropriate."
Liverpool are likely to be fined as they are held responsible for pitch security by Uefa.
The two people, who were due before Liverpool magistrates on Wednesday, are well-known in Spain for their pitch invasions and have their own website.
During Euro 2004, one member ran onto the pitch when Portugal were playing and hurled a Barcelona banner at the club's former player Luis Figo.
Like Figo, Mourinho was once a Barcelona favourite.
But he has become a hate figure for fans following the controversy surrounding Chelsea's games against Barcelona in the last 16 of the Champions League.
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Match of the Day - Post-match interviews