Erik ten Hag has told Lisandro Martinez not to enjoy Argentina's World Cup celebrations too much as Manchester United prepare to resume their Premier League campaign.
The central defender played a part in five of Argentina's matches in Qatar, though not the final, before returning to his homeland.
Hundreds of thousands of delirious fans mobbed the victorious players when they arrived back in Buenos Aires and celebrations have continued all week.
Martinez was pictured wearing sunglasses and looking the worse for wear alongside Cristian Romero and Nahuel Molina the day after Argentina's celebrations.