Chelsea boss Thomas Tuchel concedes overturning Real Madrid's Champions League lead is a mammoth task.
Chelsea go into the quarterfinal second-leg in Madrid on the back of a 6-0 win at Southampton, but still need to overturn a 3-1 deficit.
"The result and performance (at Southampton) is good because I am sure that lifts everyone's spirits," Tuchel said.
"But the task is huge. Let's be honest.
"Everything is possible in football, but let's be realistic — it is still the Bernabeu and an opponent very different from today.
"But it is the best way to prepare."
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