Whatever country, whatever league, whatever level, it takes a brave player to don the strip of two fierce footballing rivals during their career. Not many do so, whether it be down to sheer respect for a former club or simply because they dare not face the ridicule, it's a huge step to take.
Granted, Real Madrid and Atletico Madrid don't have the most heated of rivalry in world football (El Clasico is perhaps more important to Los Blancos), but a rivalry it is nonetheless.
With a transfer across the capital nearing ever closer for one Marcos Llorente, we here at 90min have taken a look at the eight players to play for both of the two biggest clubs in Madrid.