Full-Backs: Dani Carvajal and Alex Telles
Dani Carvajal has been Real Madrid's right-back for a long time and he should be continued for the next season. The Spaniard is an experienced player and will be important for the club during this transition period. Real Madrid should also develop Theo Hernandez keeping in mind the future of the position.
Marcelo looks set to leave this summer and hence, Real Madrid's priority would be to sign a left-back in the upcoming transfer window. A good option to consider would be Porto's Brazilian defender Alex Telles. The footballer has played for Galatasaray and Inter Milan in the past and is an experienced player. He is good with the attack and an excellent defender. Most importantly, he would come at a cheap price for the club.
Center-Backs: Sergio Ramos and Raphael Varane
Real Madrid's central defenders in Sergio Ramos and Raphael Varane have formed a formidable partnership and it would be difficult for the club to think of another duo at the back.
Sergio Ramos is the captain of the squad who has now also become the central figure at the club. His presence is important in set-pieces and penalties too. Hence, Ramos will be a certainty for the next season too.
France defender Raphael Varane has achieved a lot at a young age and with the skills he possesses, he would be a part of Real Madrid's defense for a very long time.