Klopp's first Liverpool XI v Klopp's latest Liverpool XI
Jurgen Klopp took over Liverpool on 8 of October 2015 from Brendan Rodgers after having won two back to back titles with Dortmund in the Bundesliga. Liverpool were in desperate need of managerial change.
After an "almost" 2013-14 season, where they finished second in the Premier League, Liverpool under Rogers could not keep the momentum going, largely due to the loss of Luis Suarez. That is when the management decided to bring in Klopp, mid-season.
His first game in charge was against Tottenham Hotspur at White Hart Lane. Though the team held Spurs to a 0-0 draw, they never really looked convincing. Since then, Klopp has led them to a top-four finish, a UEFA Champions League final and made Liverpool arguably the best team in the League and favourites to win it this year.
Here is a comparison between the playing XI that Klopp inherited from Rogers and the XI that he usually puts out on the field today. The formation for the Tottenham game was a 4-3-3 and thus the comparison will be with a 4-3-3 even though recently Klopp prefers the 4-2-3-1 formation. Also, the recent list will consider the currently injured players as without them the real XI will not be on display.
Simon Mignolet (2015) v Alisson Becker (2019)
To be fair, Mignolet was very good in that particular match against Spurs. He made crucial saves and helped Liverpool keep a long-awaited clean sheet. Mignolet recorded his 13th clean sheet, more than any other keeper in 2015.
However, he never really managed to earn the trust of the Anfield faithful, something that Alisson has been able to do. Alisson has shown his skills on the ball and his shot-stopping ability. Apart from the mistake against Leicester, which he vowed never to repeat and the error against Man Utd, he has been brilliant between the sticks, making match-saving stops against Brighton, Chelsea, Napoli and many other teams. Definitely an improvement over his predecessors.