Real go to Istanbul defending a 3-0 lead.
"We have a difficult match ahead and if we want to be in the semi-finals we must play a good game, like we did in the Santiago Bernabeu stadium," said Coentrao.
"The footballers on this team are used to playing in these kind of unfavourable environments. These supporters are different. We're going to have to remain calm and do our job in order to achieve a good score. We can't be thinking of the atmosphere because we have to be focussed on what's happening on the pitch."