Zinedine Zidane accepted responsibility for Real Madrid's sluggish display in the first half of their derby victory over Atletico Madrid.
Karim Benzema's goal early in the second half secured a 1-0 win for Los Blancos at Santiago Bernabeu, extending Madrid's lead over second-placed Barcelona to six points on the Liga standings.
However, Madrid were certainly second best before the break and were fortunate not to have gone behind, with Vitolo going close and Angel Correa hitting the woodwork.
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Zidane made two changes at the break, introducing Vinicius Jr - who played a key part in Benzema's winner - and Lucas Vazquez, with Federico Valverde, who had started out wide, moving inside.