After returning from a successful loan spell at Bayern Leverkusen, Dani Carvajal has held the starting Real Madrid right back job for two successive seasons.
He has only won a Champions League title in that time, but he has stopped Los Blancos from purchasing another right back due to his consistently good form.
Chelsea have had a solid right back for two seasons in Branislav Ivanovic, but the Serbian's confidence seems to have dropped after a poor start to the season.
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Chelsea manager Jose Mourinho undoubtedly noticed this drop in form and added Baba Rahman at left back from Augsburg. This addition could mean that in the future Azpilicueta will move to right back while Rahman moves to the left.
Even though Azpilicueta and Baba Rahman are both great tackling full backs, Azpilicueta will be 30 by 2017. If that partnership begins this year, they could work very well together if Rahman can defend as a unit with Terry and Cahill. However, there is also a time limit on how long Azpilicueta will be at the top level.
Carvajal Crucial for Los Blancos?
The 23-year-old will be sharing right back minutes with new signing Danilo, who joined from FCP for £26 million in the summer. Alvaro Arbeloa is also at the club and he will likely leave due to Danilo's arrival, which puts the two younger right full backs in contest for the first team job.
Carvajal will be fuming if he loses his first team place after two very strong years will Real. Over 76 appearances across all competitions since 2013, he has averaged a 7.27 match rating, according to whoscored.com.
The Spaniard has made an average of 2.7 tackles and two interceptions per game from right back, and when you consider how much defending Real Madrid do in most games, that means that not much gets past him.
The versatility is also very much there in Carvajal's game. In the Champions League, Los Blancos often play on the counter a lot more than in the Liga BBVA, which means they will be defending deeper.
Carvajal made 2.5 clearances per game in both seasons playing in the UCL, which is one clearance per match less than he made in La Liga. Essentially, Carvajal is able to play as a resolute defender on the right side, as well as a wing back that bombs up and down.
In La Liga last season, Carvajal created 30 chances in 30 games. When you consider the lightness of Madrid's midfield and the amount of chances the attackers create for themselves, Carvajal puts in a good shift attacking-wise.
Blues Defence Needs Reinforcements
The amount of goals Chelsea have conceded so far this season is clearly a worry for them, and a lack of youth in their defence could be an issue.
Because of the smallness of their squad, their defenders played an incredible amount of minutes last season. Their legs could be slowing, which means that a change is needed sooner or later. If Chelsea want to defend their title - even if they want to finish in the top two places - Carvajal could be a long term option on the right side.
The Spaniard's price tag could also be lower than it was in previous windows due to the presence of Danilo. If their defensive problems persist into the winter leg of the 2015-16 season, Carvajal could be a crucial buy for them.