World Cup winners Frank Leboeuf and Heather O'Reilly, former Leicester City and Celtic manager Martin O'Neill, former Brazil goalkeeper Heurelho Gomes and Iceland midfielder Johann Berg Gudmundsson reveal the secrets of navigating the knockout stages of a football tournament. We'll also hear about how players can prepare for these huge matches away from the pitch thanks to Professor Steve Peters, who specialises in mental health and the functioning of the human mind. Narration by Delyth Lloyd. (Image: France win the World Cup, Credit: Getty Images)