The Brazil centre-back had already been ruled out of the Champions League quarter-final with Bayern Munich later in the day.
Champions League: Paris Saint-Germain without Marquinhos, Marco Verratti for second leg against Bayern Munich
"We will see how Marquinhos feels tomorrow. He should be able to be in the squad, not to start, but he could be on the bench," Pochettino on Monday told reporters when asked about the fitness of the Brazilian defender.
The commotion off the field seemed to affect PSG's players as Nantes dealt the French champions a seventh Ligue 1 defeat of the season.
Ligue 1: Neymar in PSG squad for Marseille clash after beating COVID-19; Kylian Mbappé, Marquinhos still out
PSG coach Thomas Tuchel is not sure whether Neymar, winger Angel Di Maria, goalkeeper Keylor Navas or midfielder Leandro Paredes will start the game at Parc des Princes.
Champions League: PSG script late comeback to beat Atalanta, reach semi-finals after years of disappointment
After years of failing to live up to their billing in Europe, PSG are within 90 minutes of the Champions League final thanks to their dramatic win over Atalanta on Wednesday.
Neymar was sent off as Paris Saint-Germain overcame more sloppy defending to beat Bordeaux 4-3 on Sunday and move 13 points clear at the top of the French league.
French League Cup: Marquinhos, Neymar set-up convincing victory for Paris Saint-Germain over Reims to seal final berth
Neymar was involved in all three goals as Paris Saint-Germain (PSG) cruised past Reims 3-0 on Wednesday to set up a League Cup final against Lyon.
Top 20 footballers nominated for 2019 Ballon d’Or responsible for producing 505 tonnes of emissions, says study
Paris St Germain player Marquinhos alone accounted for 53.5 tonnes of CO2 emissions, while Ballon dOr hopefuls Lionel Messi of Barcelona and Virgil Van Dijk of Liverpool were responsible for 20.9 tonnes and 16.5 tonnes respectively
Ligue 1: Reigning champions Paris Saint-Germain stunned by rock-bottom Dijon ahead of Club Brugge clash
Paris Saint-Germain suffered a shock 2-1 defeat at the hands of rock-bottom Dijon on Friday in a sapping setback to morale just days before they tackle Club Brugge in the Champions League.
Ligue 1: Edinson Cavani, Kylian Mbappe suffer injuries in PSG's 4-0 win over Toulouse; Rennes go top
PSG's Eric Maxim Choupo-Moting scored a second-half double, but only after coming on as a substitute for the injured Cavani, while Mbappe also departed the scene after appearing to pull up with a hamstring injury. Mathieu Goncalves and Marquinhos scored the other two goals.
French Champions Trophy: Kylian Mbappe stars as Neymar-less Paris Saint-Germain beat Rennes to win first title of season
Kylian Mbappe provided the moments of magic as Paris Saint-Germain collected their first silverware of the season with a French Champions Trophy victory over Rennes.
Copa America hosts Brazil began preparations for the tournament at their training centre in Teresopolis on Wednesday, despite missing most of their team.
Ligue 1: Paris Saint-Germain hoping to finally secure title at fourth time of asking against Cesc Fabregas-less AS Monaco
It has turned into an epic limp towards the finish line, but Paris Saint-Germain will hope to finally secure the Ligue 1 title when they host Monaco.
Ligue 1: Paris Saint-Germain on cusp of clinching sixth title in seven seasons; Lille gunning to secure second place ahead of Lyon
Paris Saint-Germain can clinch a sixth Ligue 1 title in seven seasons and complete the first part of a domestic double after reaching the French Cup final.
Ligue 1: Kylian Mbappe becomes youngest ever player to score 50 French league goals as PSG cruise past Nimes
Kylian Mbappe became on Saturday the youngest ever player to score 50 Ligue 1 goals after striking twice in Paris Saint-Germain's comfortable 3-0 win over Nimes that tightened the champions' grip on the French title.
Champions League: Manchester United succumb to PSG's class as ghosts of past European defeats resurface at Old Trafford
The past has certainly allowed Ole Gunnar Solskjaer to evoke beautiful memories, but it haunts Manchester United too on European nights
French Cup: Paris Saint-Germain score thrice in extra time to beat Villefranche in last-16 tie; Rennes defeat 10-man Lille
Paris Saint-Germain required extra time to overcome third-tier Villefranche in the last 16 of the French Cup while Rennes came from behind to beat 10-man Lille.
Ligue 1: Edinson Cavani, Kylian Mbappe score as Paris Saint-Germain bounce back from League Cup exit with win over Amiens
Edinson Cavani and Kylian Mbappe scored as Paris Saint-Germain responded to their shock midweek League Cup defeat by claiming a 3-0 win at Amiens.
FIFA World Cup 2018: With Neymar fit and other key players showing form, Brazil are favourites to clinch title for 6th time
For the sceptics, Brazil's football may not be beautiful anymore, but looking at their squad for the upcoming FIFA World Cup in Russia, the team can certainly be termed as favourites to clinch the ultimate prize for the sixth time.
FIFA World Cup 2018: From Sergio Ramos to Mats Hummels, top ten defenders to watch out for in Russia
Check out the top defenders who are likely to set the stage ablaze at the 2018 FIFA World Cup