Jose Mourinho's Chelsea play against Paris Saint-Germain on Wednesday night, hoping to respond from their shock defeat to Crystal Palace in the Premier League at the weekend.
The 2012 European champions will be hoping for better as they travel to Parc de Princes in the UEFA Champions League quarter-final first leg.
Here are a few key battles that could determine the outcome of the game:
Zlatan Ibrahimovic v John Terry
Chelsea's captain will need to be at his rejuvenated best if he is to keep Ibrahimovic quiet. The enigmatic Swede is one of the best strikers in Europe and Terry will only have to ask his central defensive partner Gary Cahill about the damage that he can wreck, as he was in the England side which lost to four of the strikers goals in November 2012.
Christophe Jallet v Eden Hazard
Jallet - one of PSG's unsung heroes - is likely to be called upon due to the absence of Dutch international Gregory van der Wiel with a knee injury and Belgium winger Hazard may fancy his chances.
The right-back has been capped by France five times but Hazard has torn apart more renowned full-backs this season and will be vital for Chelsea on Wednesday, especially on the counter-attack.
Alex v Fernando Torres
Alex made 135 appearances - scoring 11 times - for Chelsea during his time at the club between 2007 and January 2012, winning a Premier League title and two FA Cups.
Torres has had another tough campaign, but with Samuel Eto'o out due to a hamstring injury he picked up in their 6-0 win against Arsenal, Mourinho will have to call upon the Spanish international and his mobility may be desired in this tricky away tie.
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