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While Alvaro Arbeloa usually produces efficient performances, he is arguably the weak link at Real Madrid. He provides little attacking threat and is okay enough defensively not to be targeted as a weakness.
Madrid could do with a player who provides a more attacking threat but without any defensive deficiencies. They already have that player in Sergio Ramos, but this move would be bold for two reasons.
Firstly, Sergio Ramos may not want to revert to his old position, despite his excellent performances at full-back and the fact that it would benefit the team.
Secondly, the central defender who replaces him would have to be of high quality. Mourinho could use either Raphael Varane, Raul Albiol or Ricardo Carvalho in Ramos' place, but Varane is too young, Albiol is not fully trusted and Carvalho is too old.
Daniel Agger was one player linked (via the Mirror) during the summer, and he would provide a reasonable option for the squad.
In Ramos, Mourinho already has a player in his squad capable of giving him an upgrade at right-back, but Mourinho would have to ensure that he is kept happy.