The negotiations between Madrid and Benfica have been far from straightforward. The Portuguese club made the Los Blancos toil hard to move the deal forward, which was why the left back couldn't join the Spanish giants for the Club World Cup. At one point, talks stalled due to Benfica’s firm stance on demanding the full €50m release clause. However, Madrid held their ground, refusing to meet that valuation. Behind the scenes, the efforts of Carreras’ agent, Gines Carvajal, proved crucial in keeping the deal alive.