The 25-year-old custodian spoke of his delight at beating bitter rivals in the 'Clasico' and remained adamant his side will keep in touch with Ligue 1 leaders Montpellier
Arguably the biggest match on the French football calendar, it was Carlo Ancelotti's men who opened the scoring inside six minutes. A wayward Christophe Jallet volley picked out Jeremy Menez who guided the ball into the net and past goalkeeper Steve Mandanda.
The visitors hit back, and got their equaliser soon after the break with Andre Ayew heading home from Loic Remy's pass. The lead lasted mere seconds before Alex headed in a corner at the other end to seal all three points despite Mohamed Sissoko's late red card.
The 25-year-old custodian was in buoyant mood after the victory over the capital club's rivals.
"It's a game unlike any other. Today we were better, we played with heart," the Italian told reporters from Canal+ after the full-time whistle.
"We wanted to win because it keeps us near Montpellier. We worked to achieve this and we really need to continue playing this kind of game."
As a result of the victory, PSG move onto 63 points, joint-top with Montpellier who play their game in hand against Didier Deschamps' Marseille on Wednesday. Ancelotti's men are again in action next Saturday away to Auxerre.