Diego Costa biography: Chelsea striker's route to the top - from those who shared his journey

Diego Costa’s journey from the poor city of Lagarto in north-east Brazil to become one of the Premier League’s best strikers stands now as one of modern football’s fairy tales. Just how hard that journey was, and the scrapes he endured along the way, have been vividly brought together by the Spanish journalist Fran Guillen in his new biography of the Chelsea striker, Diego Costa: The Art of War.