Lyon coach Claude Puel admitted his side "got what we deserved" after they were beaten 3-0 by Rennes on Sunday.
The seven-times French champions fell to their first defeat in Ligue 1 this season thanks to a hat-trick from Mickael Pagis.
While the veteran forward was in irresistible form, Lyon looked desperately off the pace after their Champions League exertions in midweek and Rennes could have been even more convincing winners.
And Puel admits his side simply did not show up to the game.
"We saw a great Rennes side, but not a great Lyon team," he told the Lyon website. "It's very difficult to lose without feeling like we could have done something. We got what we deserved.
"Pagis caused us plenty of misery, he's an excellent player but we gave him too much space."
Lyon's players refused to accept the side were suffering the consequences of their hard-fought draw with Bayern Munich on Tuesday, seeing as Rennes were also involved in European football on Thursday.
"Tonight we received a real slap in the face," said forward Frederic Piquionne. "Rennes played on Thursday in the UEFA Cup, so physically we should have been better than them.
"We're still top of the league but the others are coming up behind us quickly."
Despite the defeat, Les Gones still have a two-point cushion over their nearest rivals Toulouse.