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The Swedish hitman is on loan at Scotland's champions and has made a big impression.

As a result of that, Celtic have contacted City about a permanent deal.

Guidetti, 22 is out of contract at the end of the season but the Glasgow giants want to agree an early deal to head off competition in the summer.

City are also keen to do a deal in the New Year and a £3m switch is likely.

Meanwhile, the Premier League champs are eyeing another Porto player, having already signed Eliaquim Mangala and Fernando.

City scouts have been checking on Mexico midfielder Hector 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.