Pep Guardiola labelled Real Madrid the kings of the Champions League as the former Barcelona boss prepares to lead his Manchester City side against the club he wants to emulate. City travel to the Santiago Bernabeu on Wednesday for their Champions League last-16 first-leg clash. "The players who have played there have played so many times in the [Champions League] final and I don't know how many times each one has lifted it. "[But] we must be ourselves in the 180 minutes against Real Madrid. It is the real, real test."