The president of Paris St-Germain and the sporting director of the club are being investigated by Uefa.
Danny Makkelie is a Dutch referee.
An investigation has been opened by Uefa.
Referee Makkelie has reportedly written in his report that Al-Khelaifi and Leonardo "blocked the door" of his dressing room.
The general principles of conduct will be considered by the European football governing body.
The Real Madrid goal in the 61st minute created a feeling of injustice, according to the manager of Paris Saint-Germain.
Donnarumma was in the build-up to the game.
The French forward scored two more goals in the 17th and 18th minutes to send his side through to the quarter-finals.