Ed Sheeran fans are being warned of fake tickets ahead of his four night sellout tour at the Principality Stadium in Cardiff.
It's thought a quarter of a million people will arrive in the city for the concerts between Thursday and Sunday, but there are concerns over thousands of invalid tickets.
The pop star's team revoked tickets from known touts and cancelled tickets listed on re-sale site Viagogo. Fans who bought tickets from a re-sale site will be offered genuine tickets in their place.
One fan who bought tickets for him and his girlfriend on the Viagogo site found out they were not genuine.
Jack Pearce from Trowbridge paid £160 for a pair of Ed Sheeran tickets - almost double the £45 face value price. However, after buying the tickets he found out they were invalid. He was allowed to change the tickets but was forced to pay for a new pair.
It comes as an ITV investigation found online ticket reseller Viagogo has been advertising and selling Ed Sheeran tickets that do not exist. The investigation discovered fans at Wembley Stadium had paid up to three times the face value of the tickets only to find out on the day that they did not exist.
Concert goers who bought tickets from other selling sites like Viagogo will get help in claiming refunds at the box office and will be offered the chance of buying genuine tickets.
Viagogo have been asked for a comment but have failed to respond to the allegations.
Fans of the pop superstar have also been issued a travel warning ahead of his gigs.
A full city centre road closure in Cardiff will be in place each night along with enhanced security checks when entering the stadium. Fans are strongly advised to leave large bags at home.