The Argentina national team doctor believes Sergio Aguero won't be fully fit in time for the start of this summer's World Cup.
Manchester City forward Aguero underwent keyhole surgery on his left knee on Tuesday after suffering with problems for five weeks.
The 29-year-old hasn't started a Premier League game since March and is in a race to be fit for the showpiece event in Russia this summer which kicks off on June 14.
Homero D'Agostino, the Argentina national team's doctor, admitted Aguero's condition was "worrisome" and admitted he might not be fit enough.
Speaking to Radio 10 , he said: "A player has undergone an arthroscopy with 60 days to go before the World Cup. It is worrisome.
"The recovery process will require at least five weeks. When one had old injuries, the recovery process is not as fast as one would like it to be.
"It's never going to be less than three or four weeks, or even more.
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"I imagine that he will not arrive 100 per cent fit with the limited time that is left before the World Cup. "The anatomy is the anatomy. The injury is what it is.
"He can try but I don't think he will arrive 100 per cent."