Sir Alex Ferguson says he is "grateful for the three years extra" he feels he has had after surviving a brain haemorrhage in 2018.
Directed by his son Jason, 'Sir Alex Ferguson: Never Give In' recounts his journey on and off the pitch, the support of his family, and the recovery from his health scare.
And the 79-year-old Scotsman believes that audiences "may be quite startled" by the way he comes across in the documentary.
"They may say, 'he wasn't like that as a manager, he's a different guy, he's human'."
In a wide-ranging and rare interview with BBC Sport, conducted at Old Trafford, Ferguson
- Revealed he was "terrified" of losing his memory and voice after his devastating brain haemorrhage, and is "very fortunate" to still be alive.