A row between Paris Saint-Germain and Marquinhos over his participation at the 2016 Olympic Games could spark a move away from the club with Manchester United, Barcelona and Arsenal circling.
Marquinhos, 22, has been named in the Brazil squad looking to win Olympic gold on home soil this August in Rio de Janeiro. PSG are under no obligation to release their player for the tournament, and recently appointed manager Unai Emery has suggested he will now attempt to block the defender's participation.
"I have spoken a lot with the president and [PSG sporting director] Olivier [Letang] and we know the importance of the Olympic Games for Brazil and for Marquinhos," Emery told RMC Sport.
"But we also know PSG is important, as is participating from the beginning of the season and to be there the whole month of August. For the club, it is better that the players are with us."
Brazil are desperate to triumph at this summer's Games after their humiliating exit at the 2014 World Cup and have called upon Barcelona star Neymar and Bayern Munich winger Douglas Costa as two of their three permitted over-age players to ensure they field their strongest squad.
PSG's attempts to block Marquinhos' participation are unlikely to go down well in the Brazil camp and have also frustrated his brother Luan, who warns it could even force the Brazil international to leave the French champions. He told L'Equipe, as translated by Get French Football News: "Marquinhos has always been professional with the club, he has never complained. He has also often been merely a spectator in some of the big matches. PSG does not want to know but we have always been clear: Marquinhos will play at the Olympics.
"Up until now, we were mouldable. But this cannot continue otherwise we will collide. Our patience has its limits. We love the club, the fans, but we also have to be shown a minimum amount of consideration otherwise we are going to have to leave PSG."
L'Equipe adds Luan revealed United, Arsenal, Chelsea and Barcelona were among the clubs interested in signing his brother.
Marquinhos was strongly considered by Barcelona as an option to remedy their long-standing troubles at centre-half . However, the Catalan giants have since completed the signing of France international Samuel Umtiti from Lyon.
Marquinhos' failure to nail down a consistent first-team place at centre-half for PSG has often seen him linked with a move away from Parc de Princes and in 2015 he refused to rule out a move to the Premier League after learning Manchester United were interested in him.