Historians have discovered a letter suggesting some West Germany players took a banned substance before the 1966 World Cup final loss to England.
The Telegraph reports a letter has been discovered in Berlin that alleges three West Germany players took ephedrine.
The letter is said to have been written by the former chairman of Fifa's medical committee Yugoslav Mihailo Andrejevic who said samples of the substance were discovered in the offending players.
However, there are suggestions the substance was used to treat cold symptoms, though ephedrine was listed as a banned drug prior to the tournament.
England won the final 4-2, but there has always been heated debate over Geoff Hurst's strike which gave the host nation a 3-2 lead at Wembley.