Real Madrid and Barcelona both intend to test Manchester City's resolve for Sergio Aguero.Marca says Real have turned their attention to City star Aguero, who is currently in Brazil with Argentina ahead of their World Cup opener against Bosnia on Sunday.
Reports earlier this month indicated Real's La Liga rivals Barcelona had made an opening bid for Aguero in the region of £56m.
City have no interest in selling the former Atletico Madrid man, but may be forced into a transfer should the player wish to move back to Spain.
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