At his omnipotent, marauding, savant best, Lionel Messi is a force which can beat an entire opposition defence on his own and thus, it was apparent that nullifying Messi was gonna be PSG’s way to victory. And the French side shackled Messi so brilliantly that the Argentine was forced deeper and deeper into his own half to finish the game without a single touch in the opposition penalty area.
The five-time Ballon d'Or winner cut a frustrated figure throughout as he turned in his worst performance in a Barcelona shirt. Messi was not only dreadful in front the goal with zero shots on target but also gave away more balls (18) than everyone on the field except for Neymar (31). Much of the credit for rendering Messi ineffective goes to Unai Emery and his well-organised side who pressed high into the opposition half, isolated the crucial link Sergio Busquets to prevent forward passes from midfield and always had two-three closely placed players to lock Messi's movement whenever the Argentine got hold of the ball.
Here's a visual explanation of how PSG contained the 'Messi threat':