Jose Mourinho's Chelsea play Paris St Germain on Wednesday night, bidding to respond from the loss at Crystal Palace which saw the Portuguese concede defeat in the Premier League title chase.
The Blues will hope for better in the Champions League quarter-final first leg at the Parc des Princes.
Here, Press Association Sport takes a look at the key battles which could determine the outcome of the contest.
ZLATAN IBRAHIMOVIC v JOHN TERRY
Enigmatic Swede Ibrahimovic has his own slogan 'Dare to Zlatan' and is among the world's leading strikers. He can do everything. Chelsea captain Terry faces a true test of his rejuvenation this season against a man Mourinho knows well. Terry's likely central defensive partner Gary Cahill is well aware of the havoc Ibrahimovic can wreak as he was in the England side which lost to four of the striker's goals in Stockholm in November 2012.
CHRISTOPHE JALLET v EDEN HAZARD
Jallet, one of PSG's lesser-known players, is likely to be called upon due the continued absence of Gregory van der Wiel (knee), and Belgium forward Hazard may fancy his chances. The right-back is capped by France, but Hazard has torn more renowned full-backs apart this season and will be Chelsea's go-to man again, particularly on the counter-attack.
ALEX v FERNANDO TORRES
Alex made 135 appearances, scoring 10 times, for Chelsea between 2007 and January 2012, moving four months prior to the European Cup win after falling down the pecking order. He joined in 2004 but spent three seasons on loan at PSV Eindhoven. Torres has endured another difficult campaign, but with Samuel Eto'o (hamstring) a fitness doubt, his mobility will be desired away from home. The Spaniard will hope to show his ability on a night when the focus will be on Ibrahimovic and Edison Cavani.