Aurelien Tchouameni posted a long message after Real Madrid fined him and Federico Valverde. Real Madrid’s week was expected to revolve around Sunday’s El Clasico against Barcelona. Instead, an internal clash drew all the attention.

Real Madrid team-mates Federico Valverde and Aurelien Tchouameni were involved in a dressing-room fight at the club’s training ground on Thursday, one day after an earlier altercation between the pair...