"It's worrying when a player injures himself in the same place," Argentina coach Alejandro Sabella said after dropping Messi from the South Americans' friendlies against Ecuador and Bosnia-Herzegovina. "Being injured so near the World Cup could be influential."
Barcelona leads the Spanish league but will now be without Messi for up to eight games, including its last two Champions League group games against Ajax and Celtic, four Spanish League matches and the two legs of the Copa del Rey's round of 32.
Despite his many injury problems this season, Messi has scored 14 goals in 16 games. But he endured a four-game scoreless streak in the league an eternity by his standards and he hasn't had his usual burst of speed when playing less than fully fit.
"Messi needs to stop and take care of himself," Barcelona teammate Cesc Fabregas said. "I also went through a very bad year-and-a-half at Arsenal because of the same injury. I hope he recovers, and that he takes all the time he needs to make sure he's well."
Barcelona also said Fabregas had injured his right knee in Sunday's game, and will miss Spain's upcoming friendlies against Equatorial Guinea and South Africa. Barcelona teammate Marc Bartra was called up to replace Fabregas for the friendlies to be played on Saturday and next week.