The Blues conceded to Ezequiel Lavezzi in the fourth minute when John Terry failed to clear a cross properly with a header before David Luiz was unable to deal with a Lavezzi free-kick in the second half to see the ball go into the back of his own net.
Chelsea's display was criticised by Mourinho after the match with the Portuguese suggesting he was prepared to tear his players to shreds in the dressing room.
"It's ridiculous [the defending for the third PSG goal]," he told Sky Sports.
"Don't ask me to tell you that [what I plan to say to the players]. I can't do that. I have to do it inside not outside.
"But we played against a great team full of good players, especially their attacking players are fantastic. You would expect them to score fantastic goals. You don't expect them to score the goals they scored.
"The first goal was a ball in an easy position. After the cross come we assist the striker and nobody fought the second ball in a crucial position.
"The second goal it was one of my players on his own goal-line but that's obviously unlucky.
"But the way the team was positioned defensively was not the correct one. The third goal was even more sloppy; ridiculous."
Eden Hazard managed to level for Chelsea in the 27th minute when he converted form the penalty spot but Laurent Blanc's side got the upper hand in the second half to end up with a handy two-goal buffer.
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