Five successful Barcelona comebacks in Europe
The Catalan side are again faced with a huge challenge to overturn a 3-0 deficit against Juventus, but are no strangers to the epic turnaround.
Barcelona have another Champions League mountain to climb if they are to oust Italian champions Juventus to reach the semi-finals on Wednesday, the 2015 champions trailing 3-0 from the opening leg in Turin last week.
However, the Catalans have shown that they are capable of the spectacular back home at Camp Nou in European competition through the years.
Future Barça coach Bobby Robson's Ipswich side looked to have this last 16 tie in the bag with a famous 3-0 first leg success at Portman Road.
However, inspired by Johan Cruyff's double and an 87th minute penalty from Carles Rexach, Barça levelled the scores on aggregate.
After a goalless extra-time, the hosts prevailed 3-1 on penalties.
A year later, Barça produced another fight back to edge through on penalties on their way to winning the 1978/79 Cup Winners' Cup.
Johann Krankl, Juan Carlos Heredia and Rafael Zuviria got the goals in normal time before Dutch legend Johan Neeskens struck the decisive penalty in a 4-1 shootout win.
Arguably Barça's finest comeback before their miraculous feat against PSG a month ago came in the semi-finals of the 1985/86 European Cup.
Pichi Alonso's hat-trick overturned a 3-0 first leg deficit against Swedish champions Gothenburg before Barça edged another penalty shootout 5-4.
As another good omen for Barça, they also beat Juventus en route to the final that year.
Allegri's Milan precedent
Juventus coach Massimiliano Allegri has already suffered at first hand what a bruised Barça are capable of. In 2013, Allegri's Milan side won the first leg of their Champions League last 16 tie 2-0.
However, Lionel Messi quickly cancelled out the Italians advantage with two sensational first-half strikes before David Villa and Jordi Alba completed the comeback.
Can lightning really strike twice? Barça looked down and out after a 4-0 thrashing in Paris on Valentines' Day back in February.
No side had ever overturned a 4-0 first leg deficit in Champions League history and even Neymar declared Barça had just a one percent chance.
However, the Brazilian inspired a mad final 10 minute spell as Barça scored three times to progress.
Luis Suarez, Layvin Kurzawa's own goal and a Messi penalty brought Barça back into the tie before Edison Cavani's away goal looked to have given PSG the breathing space they needed.
However, Neymar's brilliant free-kick and penalty set up a grandstand finish as his cross was then turned home by Sergio Roberto in the 95th minute to unprecedented scenes of celebration at the Camp Nou.