Daniel Austin - BBC Sport senior journalist; Natalie Pirks - BBC Sport correspondent When a senior coroner declared on Monday that repeatedly heading footballs "likely" contributed to the brain disease which was a factor in the death of former Leeds United and Manchester United defender Gordon McQueen, the relationship between heading and neurodegenerative illnesses was thrown into the spotlight again.

Daniel Austin - BBC Sport senior journalist; Natalie Pirks - BBC Sport correspondent When a senior coroner declared on Monday that repeatedly heading footballs "likely" contributed to the brain disease which was a factor in the death of former Leeds United and Manchester United defender Gordon McQueen, the relationship between heading and neurodegenerative illnesses was thrown into the spotlight again.

Ex-Fifa president Sepp Blatter has suggested football fans boycott games in the United States at this summer's World Cup over security and safety concerns.