The former Arsenal defender has put Lyon's disappointing defeat down to lack of determination and admitted that his reliance on academy players backfired badly.
He told reporters: "Today we underperformed as a team particularly in the first half where we were awful.
"Obviously Lille deserve some credit for making it hard for us, but my team did not show all the commitment I would expect from them. Tonight we were deservedly punished by a very good team.
"I am very disappointed tonight. The lack of energy and effort which the players have shown is very disappointing. I think the team were lacking in experience tonight. We used a lot of players from our academy and obviously that can be an advantage sometimes."
Paris Saint-Germain now have a six-point lead at the top of Ligue 1, with Lyon two points ahead of Marseille in second place.