Argentina's team doctor says Sergio Aguero will not be fully fit for the start of the World Cup in Russia after undergoing keyhole surgery on his left knee.
The Manchester City striker had the operation on Tuesday and the English club said he would likely miss the rest of the season.
Homero D'Agostino, the Argentina Football Association's doctor, told radio station Radio 10 that Aguero's recovery "should take at least five weeks" and that the striker's condition was "worrisome."
D'Agostino added on sports network TyC Sports that Aguero "is not going to be 100 percent in shape with so little time prior to the World Cup."
The World Cup starts on June 14, with Argentina's first game coming two days later against Iceland.