Ed Sheeran says he's "deeply concerned" about online touts who are selling tickets on his UK tour for up to £1,000 each.
He's asking fans not to buy them for such inflated prices.
The star has teamed up with face value ticket platform Twickets for his April and May concerts.
But dozens of listings have already appeared on secondary ticketing sites offering entry at inflated prices minutes after going on sale.
A representative for Ed Sheeran told the Press Association: "We are vehemently opposed to the unethical practices that occur in the secondary market.
We have written to each of our partners, be they promoters, venues or ticketing companies detailing the way in which we expect tickets to be sold: direct to fans
"We have also partnered with a company called Twickets, which is a site aimed at the ethical resale of tickets.
"It allows fans to swap tickets at face value or less; we are pushing them as the official resale partner and a safe place for fans to swap tickets.
"We are aware and deeply concerned about the websites in question and have urged all fans not to engage with them in order to avoid being ripped off with higher prices or, potentially, counterfeit tickets.
"Once again, we urge all fans to only purchase tickets through official vendors."

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