The full-back has little doubt that his fellow Spain international still has a big role to play at the Liga giants, despite being relegated to the substitutes' bench against City
The Spain stopper was somewhat surprisingly benched in favour of Raphael Varane for Los Blancos' 3-2 win over the English champions, but the former Liverpool man has leapt to the support of his team-mate.
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"Sergio Ramos is our vice-captain, and one of the best centre-backs in the world," Arbeloa was quoted as saying on the official Madrid website.
"The coach makes the decisions and we have to respect them. Other players like [Mesut] Ozil and [Karim] Benzema did not start either.
"However, they are all still very important for Real Madrid."
Ramos, 26, has made six official appearances for the Santiago Bernabeu side this term.