When Jurgen Klopp took over from Brendan Rodgers at Anfield in 2015, Liverpool were 10th in the Premier League.
The Merseyside club are currently top of the Premier League –eight points ahead of Manchester City and they have gone from strength to strength.
The transformation is something former Manchester United boss Sir Alex Ferguson warned of..
"He has done a really good job and revived Liverpool's enthusiasm," Ferguson said of Klopp back in 2016. "It can happen that big clubs lose it. For two decades, Liverpool changed managers without building their own identity. "You can now well and truly sense that you have to count them in this year. You can see Klopp's dedication on the sideline, I'm convinced his work in training is similar. He's a strong personality. That's absolutely vital at a big club. I'm worried about him because the one thing United don't want is Liverpool to get above us."
Ferguson's fears appear to have become reality as Liverpool prepare to travel to Old Trafford on Sunday.