PSG said in a statement that the four players were currently in isolation and subject to the appropriate health protocols.
Cristiano Ronaldo and Lionel Messi transported fans back in time to the heyday of their storied rivalry, as both forwards got on the scoresheet in an exhibition match in Riyadh on Thursday.
IMAGES from the Champions League semi-final played between PSG and Leipzig at Estadio do Sport Lisboa e Benfica in Lisbon on Tuesday.
Second-placed VfL Wolfsburg breathed new life into the Bundesliga title race with a 4-1 win over leaders Bayern Munich, who lost their unbeaten record in a dramatic restart to the league after the winter break on Friday.
Confident Arsenal travel to Bayern Munich on Wednesday hoping to tame the German champions for a second time in two weeks, and are promising to attack despite a string of injuries.
LaLiga leaders Barcelona's pursuit of a 27th Spanish title gained momentum after a 2-1 comeback win over Real Madrid.
PSG will need to rely on their attack against the team they knocked out in the semi-finals last season.
Bayern Munich's perfect Bundesliga start came to a screeching halt when they drew 1-1 with visiting Cologne on Saturday after winning their first five matches of the season.
After falling 2-0 down on the night, substitute Marcos Llorente struck twice in extra-time and Alvaro Morata added a late third to ensure a famous victory for Diego Simeone's side against a Liverpool team unbeaten in their last 25 home games in European competition.
Paris St Germain's second-string side were held to a 4-4 draw at struggling Amiens after erasing a three-goal deficit only to concede a stoppage time-equaliser in Ligue 1 on Saturday. The result left PSG 13 points clear of second-placed Olympique de Marseille after manager Thomas Tuchel rested several regular starters ahead of Tuesday's first leg of their Champions League last-16 clash with Borussia Dortmund.
Bayern Munich's Robert Lewandowski and Arjen Robben scored twice each as the champions crushed Hanover 96 4-0 in the Bundesliga on Saturday to go four points clear at the top of the table as rivals Borussia Dortmund lost to Hamburg SV.
Arjen Robben scored a 90th minute winner in their 2-1 victory at Mainz 05 on Friday to send Bundesliga leaders Bayern Munich into the winter break with a commanding 14-point lead.
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German champions Bayern Munich have completed the transfer of former World Cup winner Xabi Alonso from Real Madrid on a two-year deal as they seek to boost their midfield options following a string of injuries.
A round-up of Wednesday's action in the UEFA Champions League.
Bayern Munich fought back with a deflected own goal and a late header from Thiago to claim a 2-1 win at Sevilla in an exciting Champions League quarter-final, first leg clash.
Saul Niguez announced himself as one of Europe's most promising midfielders by scoring a stunning individual goal to edge Atletico Madrid a step closer to their second Champions League final in three years.
Arjen Robben grabbed his 100th goal for the club as undefeated Bayern Munich outclassed Freiburg 2-0.
A round-up of Tuesday's action in the UEFA Champions League.
Second-half headers from Diego Godin and Raul Garcia gave holders Atletico Madrid a 2-0 win over Valencia and a place in the King's Cup quarter-finals by 3-1 on aggregate.
Roberto Firmino struck a stoppage-time winner as Liverpool beat Paris St Germain 3-2 at Anfield on Tuesday after Kylian Mbappe looked to have secured a point for the French side in a compelling Champions League Group C clash.
Raheem Sterling struck twice as the Premier League champions Manchester City beat Crystal Palace 3-1 at Selhurst Park on Sunday to stay within two points of leaders Liverpool.
Barcelona and Bayern fought hard but failed to break the shackles until the 77th minute in the match when Messi struck the first and three minutes later struck his 77th Champions League goal to double Barca's advantage.
Atletico Madrid striker Alvaro Morata scored a goal and then missed a penalty as his side began their La Liga campaign with an eventful and nervy 1-0 win at home to Getafe on Sunday which saw both teams reduced to 10 men.
Manchester United pull off one of the greatest comebacks in Champions League history.
Two late moments of Lionel Messi magic and a goal from Neymar helped Barcelona break the resistance of Bayern Munich in a pulsating 3-0 victory in their Champions League semi-final first leg at the Nou Camp on Wednesday.
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Barcelona's Neymar struck twice to put the Spanish side in the Champions League final despite a 3-2 loss at Bayern Munich on Tuesday as they progressed 5-3 on aggregate and will face Real Madrid or Juventus next month.
Paris St Germain revived their Champions League campaign with a 2-1 win over Liverpool in Group C on Wednesday, leaving the English club's hopes of reaching the last 16 hanging in the balance.
News of all that's transpired on and off the football field.
News of all that's transpired on and off the football field
Bundesliga leaders Bayern Munich survived several first-half scares in a 1-1 home draw with midtable Schalke 04 on Saturday as Philipp Lahm made his 500th appearance for the Bavarian club.
News of all that transpired on and off the football field.
German champions Bayern Munich are close to signing former World and European champion Xabi Alonso from Champions League winners Real Madrid.
Lionel Messi was in inspired form as champions Barcelona hammered Celta Vigo 5-0 on Saturday, recording a fourth straight league victory which keeps them top of La Liga after Real Madrid had put the pressure on the Catalans with a 4-1 win at Eibar.
News of all that's transpired on and off the football field
News of all that's transpired on and off the football field
Juve forward Cristiano Ronaldo had an unusually quiet game after scoring a hat-trick against Atletico in last year's competition, although he came within inches of grabbing a last-gasp winner when he sent a shot just past the far post.
Barcelona's Luis Suarez netted twice for a 2-1 win over 10-man Atletico Madrid in their Champions League quarter-final, first leg on Tuesday after the visitors' Fernando Torres opened the scoring and was later sent off.
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