Meanwhile, Borussia Dortmund breezed past Portuguese side Benfica with a 4-0 win thanks to a hat-trick from Gabon global Pierre-Emerick Aubameyang.
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The Match is scheduled on 09:00 pm local time at Camp Nou, Barcelona. It should make for an exquisite match-up with one of Europe's perennial also-rans looking to finally overcome one of the big guns at the grandest stage.
Messi dragged a shot wide and Arda headed over as Barcelona continued to chase the game, but three more goals was too much to handle.
Emery, however, said his team were unmoved by the remarkable first-leg result. They know a lot needs to go their way if they are to pull off a near-impossible task.
Barcelona have come back from two 3-0 defeats in their history.
La Blaugrana have recovered from their mauling at the hands of the Parisiens, with four wins on the trot since then, scoring 14 and conceding three in the process. Doubts hovered over Angel di Maria's inclusion as well as Thiago Motta but the team news is in as we try to figure out what both managers are thinking ahead of this one.
And PSG are no slouches in front of goal. At the same token, every road goal is worth twice its weight in gold for PSG. "I think it will be important to attack and not just think about defending".
The line setters want to test our discipline here, offering a 3.5 on a total after four goals in Paris.
But in the 40th minute PSG's calamitous defending bit them where it hurts most.
PSG, meanwhile, were quiet happy to sit back and defend throughout the first half, with the hope of catching the home side on the break.
Barcelona got the early goal they were desperate for, and had the PSG keeper to thank for it.
Fulham flop Kostas Mitroglou scored for the Portuguese side, and despite 69% possession, 14 shots, and a missed penalty from Pierre-Emerick Aubameyang, Dortmund couldn't find a way through.
The last time Barcelona was eliminated in the last 16 was in 2006-07. Where were you in 1963? They won on penalties after first-leg 3-0 defeats against Anderlecht in 1979 and Gottenburg in 1986. SportyBet tips them to score at (1.60), (1.65) and (2.05) respectively to score anytime in the match.
In fact, being at home against Portuguese opposition has been quite favorable to the German side. "La Liga is interesting to play in and Barca is a great club, there is always interest in a club like that". "On Wednesday we are going to play really well". Are you ready for their road record?
Benfica has 2 Wins, 6 Draws and 14 Losses in 22 away encounters in Germany.