The Commerzbank Arena will host five World Cup matches
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Constructors of Frankfurt's World Cup stadium, which hosts England's opening group game, have reported damage to the venue's structure.
England face Paraguay on 10 June in Frankfurt, with the new stadium already suffering from a leaky roof.
Sections of cement on a supporting column cracked open and were discovered by constructors on Wednesday.
"Two sections the size of a palm have crumbled apart," said Istvan Tyukodi of construction company Max Boegl and Co.
He said the damage was spotted on the supporting column about 40 metres above the ground on the outside wall of the stadium.
The stadium's roof was unable to keep out the rain as it should in two incidents in the last year.
Work began on upgrading Eintracht Frankfurt's famous Waldstadion in 2002 and lasted three years.
The new Waldstadion will host five matches, including a quarter-final.