PARIS (REUTERS) - Replica shirts bearing his name are flying off the shelves, followers are flocking by the million to his new club's social media accounts and TV rights suddenly look a bargain: Lionel Messi's arrival in Paris has set the money train in motion.

Paris Saint-Germain chairman Nasser al-Khelaifi bluntly told reporters on Wednesday (Aug 12) that people would be "shocked" by the revenue the 34-year-old six-time Ballon d'Or winner would bring to the football club he joined as a free agent the previous day.