#4 The underperforming fullbacks
Dani Carvajal and Marcelo are arguably the best in their positions. Last season their involvement on both sides of the pitch was instrumental in Real winning the double. Their attacking contributions especially were very important and a lot of Real Madrid game-play depends on the performance of their fullbacks.
However, this season both Carvajal and Marcelo have struggled to perform on the same level as they did last season. Marcelo especially has completely looked off the mark and their underperformance has affected Real Madrid. They haven't provided the same service to the forwards from crosses as they did last season and hence their assist numbers are down when compared to that last season.
Real Madrid would need their fullbacks to step up and perform to improve.