After referee Chris Foy admitted that he did not see the challenge, Luiz has called on the City striker to own up and make amends for a bad tackle late on in the match.
He told The Mirror: "I would apologise to everyone. Aguero is a great player and I think he needs to be honest with himself and say: 'I don't like to do bad tackles, I don't like to do that.'
"I forgive everyone in my life, people are happy when Aguero is scoring goals, doing things in the game. Many people have said to me: 'sorry this is not me and not good for the football.' Many kids see the game, watch the game and want to see good things and not bad things."
City withstood a late Chelsea onslaught to book their place in next month's final against Wigan Athletic, courtesy of goals from Aguero and Samir Nasri.