Barcelona coach Hansi Flick is already under pressure in his new job after Monday’s 3-0 defeat in a friendly game against AS Monaco, which Spanish media have called a “wake-up call.” “This is the first wake-up call,” the Sport newspaper wrote on Tuesday, while Mundo Deportivo wrote the word “Aviso” (“warning”) in capital letters on its first page. The Don Balón magazine called Barcelona’s performance “ridiculous,” while the Madrid-based AS said the team had “a disastrous presentation.” Flick, however, remains optimistic about the future. After the game, the former Bayern Munich coach stressed …