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Liverpool demolished United 4-0 on Tuesday evening and Ferguson was in the crowd at Anfield, with cameras capturing his disappointment.
Carragher joined the Gary Neville Podcast following the game and revealed the Scot knew this was coming years ago.
"I played in a game at Old Trafford, I think it was Michael Carrick’s testimonial, and Alex Ferguson went around the dressing room shaking hands, saying 'thanks for coming', I think he was manager of one of the teams," he explained.
Before and after look of Sir Alex Ferguson during the Manchester United and Liverpool match. pic.twitter.com/LeFgHE6UPx— TeamKenya.co.ke (@TeamKenyaKE) April 20, 2022
"Jurgen Klopp had been at the club about a month and he [Ferguson] came to me and said, 'you've got a manager'. I went, 'oh yeah, good, Jurgen Klopp's made a decent start', and he [Ferguson] said, 'no, no, I'm worried'.
"And that was at the time I think Manchester United were still above Liverpool, but he [Ferguson] knew through meeting him I think at the UEFA meetings or the Champions League, wherever it was, he could feel that sort of personality.
"You talk about great managers and tactics and formations, the great managers all have that, of course they do, but it's a force of personality, and that’s what Jurgen Klopp has, that's what Sir Alex Ferguson's got."
When Klopp joined Liverpool in 2015, the Reds were struggling to qualify for the Champions League on a regular basis.
Fast forward to seven years later and Klopp has a Champions League and Premier League medal to his name as well as the Carabao Cup.
United, on the other hand, haven't won a trophy in half a decade and look likely to be playing Europa League football next season.
Erik ten Hag was announced as the club's new manager on Thursday and he has a huge task on his hands.
Carragher continued to wax lyrical about Klopp and the impact he's had on Liverpool.
The former England international added: "I think at the end of his [Klopp’s] time, it will feel like when Bill Shankly left Liverpool.
"The feeling with Liverpool supporters already is, 'he's not going to go in two years is he?'.
"People are already thinking about that now because of the effect he's had on this football club."
Liverpool went top of the league after defeating United, but Manchester City leapfrogged them with a 3-0 win over Brighton on Wednesday.