Flick's tactical approach, featuring an extremely high defensive line, also seemed ripe for Mbappe and Vinicius to pillage with their pace.
Swedish prosecutors on Tuesday confirmed an investigation had been launched -- without naming Mbappe -- following an alleged rape at a plush Stockholm hotel on October 10.
Los Blancos take on their rivals without the French forward, ruled out for three weeks with a hamstring injury.
The format may be new, but few would bet against the winner staying the same.
The 2018 World Cup winner almost joined Caen as a teenager before eventually signing for Monaco.
The France captain, to his credit, was sublime in creating the goal that beat Austria 1-0, but his failure to score at a Euros will weigh heavily on a player who has found the net 12 times at World Cups, including a hat-trick in the 2022 final.
"The Euros is very important in our careers, but we are citizens first and foremost and I don't think we can be disconnected from the world around us," said Mbappe.
Mbappe, 25, verbally agreed to move to Real in February and then announced in May he would leave PSG at the end of the season.
PSG's decision to withhold Mbappe's salary is related to an agreement between the two parties made last year, at the start of the season, when the player accepted to waive part of a bonus due to him, the source said.
"You know where he wants to go," said the City coach at a golf tournament in Spain on Monday, alluding to Spanish side Real Madrid
At the time, the club communicated that Mbappe had signed a three-year extension, but in reality it was a two-year contract (until 2024, therefore) with the option of a third year that the player himself could choose to activate, or not. Mbappe said in a letter to the club on Monday that he would not activate that option
Mbappe scored his 29th league goal of the season in PSG's final game on Saturday, a 3-2 defeat by Clermont, to finish top of the Ligue 1 scoring charts yet again
Asked about his future at the awards ceremony, Mbappe replied: "I will be here again next season."
PSG's 11th domestic league triumph -– their ninth in the last 11 years -- was secured despite Christophe Galtier's team losing six games in 2023 while nearest challengers Lens have taken most of the plaudits
PSG need four points from their final three games -- against Auxerre, Strasbourg and Clermont -- to secure the Ligue 1 title after restoring their six-point lead over second-placed Lens
Mbappe reached another landmark in the match as his first-half goal against Lens made him Paris Saint-Germain’s all-time top scorer in Ligue 1 history, with 139 goals
A brilliant Lionel Messi goal helped Paris Saint-Germain to a 3-1 home win over Lens on Saturday to surely end any doubt about the outcome of this season's Ligue 1 title race, after an early sending-off left the visitors with a mountain to climb.
Mbappe signed a new contract with PSG at the end of last season to keep him at the Qatar-owned club until 2025, although French media reports have indicated that the last year of that deal is optional and down to the player
The video released by PSG on Wednesday features snippets from an interview with Mbappe, in which he talks about the club and its supporters. It links to the ticketing section on the club's website
