Jose Mourinho's Chelsea play Paris St Germain on Tuesday bidding to overturn a 3-1 quarter-final first-leg deficit in order to qualify for the Champions League semi-finals for the seventh time in 11 years.
Here, we take a look at the key battles which could determine the outcome of the contest.
JOHN TERRY v EDINSON CAVANI
Terry's strong form this season has stuttered of late, most notably in the defeat at Crystal Palace, and the captain must be at his very best against Uruguay striker Cavani. In the absence of the injured Zlatan Ibrahimovic, Cavani will be given a more central role and will hope to ensure Chelsea cannot repeat the famous 2012 comeback against Napoli, when he finished beaten at Stamford Bridge.
BRANISLAV IVANOVIC v EZEQUIEL LAVEZZI
It was Lavezzi, rather than Ibrahimovic or Cavani, who opened the scoring at Parc des Princes after a rare breach of Ivanovic's defences. The Serbia right-back must balance getting forward with leaving his team-mates exposed at the back against the lethal Lavezzi, who also has a score to settle after being in the Napoli team two years ago.
EDEN HAZARD v GREGORY VAN DER WIEL
Belgian Hazard - coveted by PSG and pictured in the Parisiens' shirt after the match in Paris - is Chelsea's go-to man. He has another opportunity to add to his burgeoning reputation by leading the Blues attack, while remaining diligent in defence. Gregory van der Wiel returned in the 3-0 defeat of Reims after a knee injury and Hazard will want to test the PSG right-back's fitness by running at him.