Brighton boss Roberto de Zerbi was left frustrated after their 3-2 defeat at Chelsea.
Enzo Fernandez scored twice as Chelsea handled Conor Gallagher's first-half dismissal to eventually win.
Asked if he was frustrated, De Zerbi said: About the result, yes, because we played a great game.
We conceded three stupid goals - the first incredible. We can be very young but we could defend better and play with more attention in that situation.
Please I don't want to speak about referees. About football, what you want.
I have to accept every decision. Referees are people like coaches and they can make mistakes.
I don't know if it was a mistake or not, if the penalty on Mudryk is clear or not."