UEFA has charged Bayern Munich coach Pep Guardiola and Porto boss Julen Lopetegui for separate incidents relating to the sides' Champions League quarterfinal second leg.

Bayern boss Guardiola was handed a charge for an "incident of non-sporting nature" after wearing a T-shirt to his pregame news conference with the message "Justicia para Topo," dedicated to Argentine reporter Jorge "Topo" Lopez, who died in a car crash during the 2014 World Cup in Brazil.

Guardiola is accused of breaching UEFA Article 11, 2c, on "general principles of conduct," which forbids the use of "sporting events for manifestations of a non-sporting nature."

#Pep: "This is the @ChampionsLeague! It's one of the reasons you coach a big club. This situation is...wow!" #FCBFCP pic.twitter.com/u7Jgmo0QFd - FC Bayern English (@FCBayernEN) April 20, 2015

German news agency dpa reports that Lopez's family believe that the investigation into the accident -- which occurred on the eve of Argentina's semifinal against Netherlands in Sao Paulo -- has been sluggish.

Lopetegui, meanwhile, has been charged following his dismissal from the bench during Porto's 6-1 defeat at the Allianz Arena, having been sent off following Ivan Marcano's late red card.

UEFA announced that the cases will be dealt with by the UEFA Control, Ethics and Disciplinary Body on May 21.

Bayern overcame Porto on Tuesday having gone into the game trailing by a 3-1 deficit, with the Bundesliga leaders joining Barcelona in the semifinals.