Sir Alex Ferguson has said he feared he would never be able to speak again after suffering a brain hemorrhage in 2018.
The two-time Champions League-winning manager spoke at the Glasgow Film Festival (GFF) on Saturday, where his new documentary was premiered.
Sir Alex Ferguson: Never Give In was filmed while he was recovering from the operation and was directed by his son, Jason.
Aware that his memory might desert him, the film sees Sir Alex recount the most important stories of his life, in and out of football. Speaking alongside his son during a virtual Q&A after the premiere, he said the recovery from the operation was terrifying.
"I lost my voice, just could not get a word out, and that was terrifying, absolutely terrifying," he said.
"And everything was going through my mind: is my memory going to come back? Am I ever going to speak again?"
With a speech therapist, he worked through exercises in which he had to recall every member of his teams and his voice came back after 10 days.
He told the Q&A that his favorite memory of Manchester United fans was on the day he won the league title for the first time.
“God almighty – I couldn’t get out of the car park,” he said.
“There were thousands of them… they could have made me president that day.”
He said the experiences he regretted most during his time in football were having to let players go, particularly youngsters.
“That is the worst thing, having to let a young player go,” he said.
“Because all his ambitions and hopes and desires are about playing for Manchester United in front of 75,000 people and going to Wembley in a final – when you take that away from them it’s a sore, sore thing. So I hated that.”
The documentary also looks at Sir Alex’s upbringing in Scotland.
Ferguson, who retired in 2013, won 38 trophies during a 26-year spell in charge of United, and previously managed East Stirlingshire, St Mirren, Aberdeen, and the Scotland national team.