Zubizarreta did warn PSG, though, that if any side can recover from such a thrashing, it is Barcelona with Lionel Messi, Luis Suarez and Neymar in attack.
Their one defeat was also the only time they conceded three goals in a group-stage game, when they lost 3-1 at Manchester City.
PSG dominated this last-16 first-leg tie throughout and took the lead through Di Maria's curled free-kick.
As Champions League football returned to out lives on Tuesday night, Luis Enrique's hopes of landing a second Champions League went out the window with a 4-0 annihilation at the hands of a tactical-savvy PSG side at the Parc des Princes. When they have not been at their best in the past, their star players have stepped up. This came after PSG had already spurned a number of good chances.
The 29-year-old left Real Madrid shortly after they lifted the famous trophy in 2013-14, having been named man of the match in the 4-1 final victory over Atletico Madrid.
"It is different in the home and away matches".
"His reaction there was poor", Ferdinand told BT Sport.
Luis Enrique has the odds stacked against him, must return to Spain where every league game is a must win, and has to find answers to some very puzzling questions or face a last 16 exit and, possibly, the end of the road for him at Barcelona.
Paris St-Germain became the sixth team to score four goals in a Champions League game vs Barcelona (after Milan, Dynamo Kiev, Valencia, Chelsea and Bayern Munich).
Edinson Cavani marked his 30th birthday with a goal as PSG thumped Barcelona, and it is a win that will live long in his memory. He really defeated Barcelona's pressing.
Kevin Trapp 6, Thomas Meunier 8, Marquinhos 6, Presnel Kimpembe 7, Layvin Kurzawa 8, Blaise Matuidi 8, Adrien Rabiot 8, Marco Verratti 9, Angel Di Maria 9, Edinson Cavani 8, Julian Draxler 8.
Barca boss Enrique was also given the score as he failed to stop the PSG onslaught.
Following the match, PSG winger Angel di Maria said: "It's hard to think of a better birthday or a better performance than this".