Liverpool host Paris Saint-Germain in the second leg of their Champions League quarter-final tie on Tuesday with a two-goal deficit to recover after defeat in the French capital last week.The Anfield side have staged some outrageous European comebacks over the years but aside from that history it is hard to make any kind of case for them to fight back against PSG. Elsewhere, Real Madrid must overcome a one-goal deficit if their pursuit of a 16th Champions League title is to continue, but that appears unlikely against a Bayern Munich side that looks like one of the best sides on the continent this season.Vincent Kompany’s side beat Los Blancos 2-1 at the Bernabeu and followed that with a fifth successive victory when they visited St Pauli on Sunday, extending their unbeaten run to 15 games across all competitions.