Pedro , 33 , died from a heart attack , former club says . The player was considered one of the world 's greatest players . The star was top scorer at 1966 World Cup . Compatriot Cristiano Ronaldo among those to pay tribute .
Eusebio , 71 , died from a heart attack , former club says . The striker was considered one of the sport 's greatest players . Portugal star was top scorer at 1966 World Cup . Compatriot Cristiano Ronaldo among those to pay tribute .