A police source told Lusa News Agency that “the quality of the cocaine is being analysed” as there are doubts as to whether it really was a drug at all.


Spanish law enforcement officials are also investigating whether the suspects, who are aged between 21 and 39, are related following reports that they were all from the same family.


According to the newspaper El Mundo, the Portuguese citizens were selling a gram of white powder, which looked similar to cocaine but had in fact been bought at the pharmacy for 70 cents, to Tottenham and Liverpool supporters for 20 euros.


The arrests were made by undercover police officers who were working as part of the security operation to prevent public order incidents during the Champions League final which took place in Madrid.