Argentina have World Cup qualifiers with Paraguay and Peru next month but Aguero has been ruled out for just under a month.
The news will irk City, though Argentina may understandably wish to verify whether the player can at least play some part in their crucial qualifiers.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.