Manchester City are watching Porto midfielder Hector Herrera.
The Daily Star Sunday says the Premier League champs are eyeing another Porto player, having already signed Eliaquim Mangala and Fernando.
City scouts have been checking on Mexico midfielder Herrera, 24.
A potential stumbling block to a deal, though, is Porto's valuation of a player known as Zorro - The Fox. Porto rate him at £35m.
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