Paris Saint-Germain captain Marquinhos and coach Mauricio Pochettino both slammed the performance of the Ligue 1 leaders in Sunday's defeat to Monaco.
The 3-0 loss, in which Wissam Ben Yedder scored a double either side of Kevin Volland's goal, is the heaviest defeat PSG have suffered in Ligue 1 since a 5-1 loss at Lille in April 2019.
PSG have now lost three of their last five games in Ligue 1, as many as they did from their previous 36 matches (27 wins and six draws).
It also represented PSG's heaviest loss to Monaco since September 1999, when the principality club defeated them by the same scoreline in Paris, and Marquinhos did not hold back in his criticism of the display.
"It's hard to digest. It's our worst game of the year," he told reporters.
"We came here to have fun and win a game. We are in a difficult moment.
"You can't just throw it all away. We all have to work together to get out of this moment."
Marquinhos stopped short of suggesting that PSG's recent Champions League elimination at Real Madrid has led the team to drop off, but claimed they could still lose their 13-point Ligue 1 lead without major improvements.
"It is not a relaxation," he added. "There were a lot of expectations [against Real Madrid]. It's a defeat that hurts us.
"Now we have goals to look for. We have to do our best, with the right mentality.
"If we continue to perform like that, it is sure that the title is in danger. The alert is there. We will have to come back [from the international break] with a good state of mind."
PSG boss Pochettino has now lost eight of his first 50 league games in the Parisian dugout, the same amount that his predecessor Thomas Tuchel suffered in his first half-century of matches.
Pochettino repeated Marquinhos's criticism of the performance after the match, calling his team's display "unacceptable".
"It is inadmissible to start this way," Pochettino said of PSG's dire first-half showing. "Afterwards, there is sporting shame.
"Now we have to move on, get over the frustration of the Champions League and think about giving our best, and have a competitive spirit.
"This is unacceptable. This first half is unacceptable. We didn't have a fighting spirit, the way we played is not acceptable.
"This cannot happen, we can have [bad] performances, but this type of attitude is not possible. It's unacceptable to start the match this way. Respect for the club, [and for] our supporters, is essential."
Neymar suffers fresh injury blow
Neymar sustained a new injury as he was forced off during Al-Hilal's AFC Champions League Elite win over Esteghlal.
Aleksandar Mitrovic plundered a hat-trick on Monday to seal a 3-0 win.
But Al-Hilal's victory was soured by an injury to Neymar, who had to make way just 29 minutes after he came on as a second-half substitute.
The Brazilian, who has just returned from over a year out of action following a serious knee injury, was forced off with what appeared to be a thigh issue.
Indeed, Monday's appearance was only the 32-year-old's second for Al-Hilal since his comeback.
He has featured just seven times for the Saudi Pro League champions in all competitions since his big-money move from Paris Saint-Germain in 2023.
Barcelona 3-1 Espanyol: Olmo brace sends Blaugrana nine points clear
Barcelona moved nine points clear at the LaLiga summit following a 3-1 victory over Espanyol in the Catalan derby.
Dani Olmo scored twice while Raphinha was also on target as Hansi Flick's side stretched their advantage over second-place Real Madrid, whose scheduled showdown with Valencia this weekend was postponed.
Barca broke the deadlock after just 12 minutes. Olmo latched onto Lamine Yamal's brilliant throughball with the outside of his boot, before beating Espanyol goalkeeper Joan Garcia with a well-taken first-time finish.
The hosts doubled their lead 11 minutes later with Marc Casado finding Raphinha, who bravely lifted over the advancing Garcia.
It was 3-0 just after the half-hour mark, as Olmo received Alejandro Balde's pass before drilling home from the edge of the penalty area.
Espanyol, who saw two goals disallowed following VAR reviews, pulled one back when Javi Puado turned home Carlos Romero's cross in the 63rd minute.
However, it proved a consolation for the visitors, who suffered their sixth defeat in seven league games.
Data Debrief: Free-scoring Barca maintain derby dominance
Now unbeaten in 27 LaLiga derbies against Espanyol, Barcelona have now scored 40 goals this season; their second-highest tally after the first 12 games of a LaLiga season (42 in 1950-51).
Following Olmo's brace, which took his tally for the campaign to five, the Blaugrana are the only team with four different players to have scored at least five goals in Europe's top five leagues this term.
In setting up Raphinha's goal, Casado is the first Barca player from Spain to provide an assist in three successive games in all competitions since at least the 2014-15 season.
Zverev soars past Humbert to claim Paris Masters crown
Alexander Zverev soared to the Paris Masters title following a commanding 6-2 6-2 victory over home favourite Ugo Humbert in the final.
The German took just 75 minutes to seal his seventh career ATP Masters triumph, and second silverware of the season.
Humbert received a raucous reception as he aimed to become the first Frenchman to win this event since Jo-Wilfried Tsonga in 2008.
However, the crowd were silenced when Zverev broke in the third and fifth games on his way to taking the opening set.
The Italian Open champion also dominated the second set, dropping just five points on serve as he wrapped up a comfortable victory.
"I knew I had to play like this to win today," Zverev said. "Ugo is an incredible player, but here in Paris, he plays even better than he usually does, and I knew that.
"Once the crowd gets involved, it's going to be difficult. So, I had to take that away early, and I did, so I'm happy about that."
Zverev was also delighted to triumph in Paris, and demonstrate the strides he has made since suffering a horrifying ankle injury during his 2022 French Open semi-final against Rafael Nadal.
"It was not 100% guaranteed that I would be back at this level," he added. "So, to win this title here in Paris means the world to me, and I'm sure it means everything to those in my box, because they have done so much for me."
Data Debrief: Zverev surpasses Medvedev and matches Sinner
Runner-up to Daniil Medvedev in 2020, Zverev went one better at the Accor Arena four years later, and will be seeded second at the season-ending Nitto ATP Finals.
The second German to win this event after Boris Becker, he surpassed Medvedev (six) with his seventh ATP Masters crown the outright most of any player born since the format's inception in 1990.
Zverev also matched world number one Jannik Sinner for the joint-most match wins in ATP Masters events this season with 28.
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