Real Madrid wing-back Marcelo admits he should've taken out Sergi Roberto before he set up Barcelona's winner on Sunday night.
Roberto's lung-bursting run teed up Lionel Messi to make it 3-2 to Barca in injury time.
Marcelo lamented: "In the end there are details. Maybe I take the blame for not having stopped Sergi Roberto. Maybe if I make the foul they do not score the goal."
He added: "What I say is that it's not just Marcelo's fault. It can happen to anyone. If the ball was far from the goal, the better. I am not to say that I left with honor or not honor. It can happen to any team."
On Sergio Ramos' dismissal, Marcelo said: "I'm not talking about the referees. It's stuffed up to be with one less. Ramos wanted to help and he could not."
