Manchester United and England star Gary Neville sees no reason why Sir Alex Ferguson should not stay in charge at Old Trafford for another decade.
The 64-year-old celebrates 20 years in charge of the club on Monday but Neville cannot envisage the veteran manager retiring in the near future.
"It would not surprise me if he was to go on for five to 10 years," he told The Sun. "Why should he leave? He's as determined as ever.
"It's a continual challenge to be at this club. I know that from being a player, I know that from being a fan. That will keep him young.
"There was a period when people were talking about him retiring but that has gone away.
"He knows the club, he knows how to make it successful. We have been developing a new side with a lot of young players and hopefully this season we can bear the fruits of that."
Ferguson originally planned to retire four years ago but Neville thinks his U-turn was the right thing to do.
He added: "The nearer it got to the time, he was thinking that he couldn't live without this and it would have been the same for anybody in his position.
"It's a void you cannot fill, whether you leave this club as a player or a manager. It's impossible, losing that excitement, that thrill."