Paris Saint-Germain lost 1-0 at Nice in Ligue 1 on Saturday ahead of next week’s trip to Real Madrid in the second leg of their blockbuster Champions League last-16 tie.
Substitute Andy Delort struck two minutes from the end as Nice won for just the second time in 18 league meetings with PSG, who struggled to create chances without suspended top scorer Kylian Mbappe.
Nice bolstered their chances of qualifying directly for a first appearance in the Champions League group stage, climbing into second place and moving two points above Marseille.
PSG remain 13 points clear at the top but the loss serves as a warning that Mauricio Pochettino’s side must sharpen up considerably to keep their European dreams intact on Wednesday.
Mbappe’s 24 goals this season are more than Lionel Messi, Neymar, Angel Di Maria and Mauro Icardi combined, and his absence at the Allianz Riviera further underlined just how he important he is to the French champions.
The France star, out of contract in July and strongly linked with a move to Madrid, will return well rested in Spain as PSG try to defend their 1-0 lead from last month.
Gianluigi Donnarumma and Presnel Kimpembe are also likely to be recalled after being given the night off at the Allianz Riviera, while Idrissa Gana Gueye only made a brief appearance.
Nice twice threatened early on through Amine Gouiri, who led the club to a first French Cup final since 1997 in midweek following a 2-0 victory over fourth-tier Versailles.
The former Lyon forward forced Keylor Navas into a save low to his right before bending another shot just wide as Nice’s quick ball movement troubled the visitors.
Neymar released Di Maria in behind the Nice defence but the Argentine’s attempted scoop was flicked behind by the fingertips of Walter Benitez.
A repeat of the 0-0 draw when the clubs met in December looked on the cards before Delort grabbed the winner minutes after Justin Kluivert wasted a glorious chance for Nice.
Calvin Stengs whipped over a cross that Delort met on the half-volley and slammed in via the underside of the crossbar to condemn PSG to a third defeat in Ligue 1 this term.
Marseille could reclaim second on Sunday when they host a Monaco side wounded by their midweek penalty shootout loss to Nantes in the French Cup semi-finals.