BUENOS AIRES — Lionel Messi won’t be in Argentina’s squad at the Olympics starting later this month in Paris. Coach Javier Mascherano included four World Cup winners in the squad he announced Tuesday, including striker Julián Álvarez and defender Nicolás Otamendi. The 37-year-old Messi, who has struggled with injuries this year, is now playing at the Copa America, aiming to defend the continental title he won in 2021.