Florentino Perez has called on the Real Madrid fans to back their team ahead of the decisive part of the season.
Zinedine Zidane's side were beaten 2-1 by Manchester City in the first leg of their Champions League last 16 tie.
"We're coming into a decisive phase of the season and it's vital that we have the strength of the Real Madrid fans to confront the challenges that can seem impossible," Perez said at a sponsorship event with Mahou.
"We've already won three trophies - the Copa del Rey of basketball and the Supercopa in both football and basketball.
"Real Madrid never give up.
"We've won 23 European Cups - 13 in football and 10 in basketball."