Jurgen Klopp has developed into one of the finest tacticians in world football since beginning his managerial career with Mainz 05 in 2001.
After seven years at the German club, he was snapped up by Borussia Dortmund, where he rose to prominence. Jurgen Klopp spent years developing the club's youngsters and establishing Dortmund as genuine Bundesliga heavyweights.
Klopp led Dortmund to the league title in 2010–11, before securing the club's first-ever domestic double the following season. Klopp also guided Dortmund to a runner-up finish in the 2012–13 UEFA Champions League.
His exploits meant he was appointed Liverpool manager in 2015. The German took over a side languishing in mid-table and desperately short of quality. He led them to an eighth-place finish and Europa League final in his first season at Anfield.
Jurgen Klopp then helped Liverpool secure a top-four spot the following season and set the foundations for a team that would go on to challenge on multiple fronts.
He guided the club to a runner-up finish in the Champions League in 2018 and went one better the following year as Liverpool beat Tottenham Hotspur to win their first Champions League title in 14 years in 2019. The German also oversaw Liverpool's march to the Premier League title last season.
Jurgen Klopp has always been lauded for his ability to improve his players, but over the years, there have been a fair few who did not quite flourish under the German.
On that note, we take a look at five players who failed under Jurgen Klopp.
#1 Loris Karius
Liverpool signed Karius from Mainz for just £5 million in 2016 with a view to providing competition to Simon Mignolet in goal.
After a promising start to life at Anfield, Karius established himself as the first-choice keeper but his form quickly dipped and a number of sub-par performances led to him being replaced by Mignolet.
Nevertheless, Klopp placed his faith in Karius by starting him in the 2018 Champions League final against Real Madrid. The German made two costly errors that gifted Madrid a 3-1 victory.
That signaled the end of Karius' career at Liverpool. He spent the next two seasons on loan at Turkish club Besiktas, and is currently on loan at German side Union Berlin.
#2 Christian Benteke
Liverpool signed Christian Benteke from Aston Villa in a deal worth £32 million in 2015. The Belgian at the time was one of the most feared strikers in the Premier League.
However, Benteke struggled to break into Jurgen Klopp's starting line-up after the German took over from Brendan Rodgers midway through the 2015-16 season. Klopp's preference for Roberto Firmino, who provided more creativity and work-rate, meant Benteke's game time was limited.
Benteke spent just one season with Liverpool during which he scored 10 goals in 42 appearances in all competitions. He was offloaded to Crystal Palace in 2016.
#3 Naby Keita
There was immense hype surrounding Naby Keita when the midfielder joined Jurgen Klopp's Liverpooin the summer of 2018. The Guinea midfielder had risen to prominence during his time in Germany with RB Leipzig and had been named in the Bundesliga Team of the Year for the 2016-17 season.
Keita made a promising start to life at Anfield, but injuries and a lack of consistency meant he was often left out of the starting line-up by Jurgen Klopp.
He has fallen behind the likes of Jordan Henderson, Fabinho, Georginio Wijnaldum and James Milner in the pecking order at Anfield, and has thus far been unable to justify the £48 million Liverpool paid for his services.
The 26-year-old has three years left on his contract with Liverpool but continues to be linked with a move away from the club.
#4 Ivan Perisic
Croatian winger Ivan Perisic is regarded as one of the most talented and versatile wingers in the modern game. The 32-year-old impressed during his two years with Club Brugge in Belgium and earned himself a move to Borussia Dortmund in 2011.
Perisic was a part of the Dortmund squad that won the Bundesliga and DFB Pokal in the 2011-12 season. He made 41 appearances and scored nine goals in his first season under the management of Jurgen Klopp.
Perisic, however, found opportunities hard to come by in his second season with the club. He told Croatian channel Nora TV that he had received no support from Jurgen Klopp and accused the manager of favoring other players. He was eventually sold to Wolfsburg in 2013.
#5 Ciro Immobile
It is hard to believe that one of the most prolific strikers in Europe was unable to thrive under the management of Jurgen Klopp. Ciro Immobile signed for Borussia Dortmund after an impressive season with Italian club Torino, for whom he scored 22 goals in 33 Serie A appearances.
Immobile was signed as a replacement for Robert Lewandowski, who left Borussia Dortmund to join Bayern Munich. Immobile struggled to fill the Pole's shoes and managed to score just three goals in 24 appearances for Jurgen Klopp's side in his sole season with the club.
Immobile was sent on loan to Sevilla and Torino for the next two seasons, before eventually being sold to Lazio, where he has gone on to become a key figure for the club.