#3 Brendan Rogers to Jurgen Klopp (Liverpool)
Jurgen Klopp has played two brilliant managerial roles in his career. After revitalizing Borussia Dortmund, he headed to Liverpool at a time when the Reds were branded the 'has-beens' of the English game.
The German took his time rebuilding the squad from scratch, working under a tight budget. As a result, almost all of his signings have proven to be value for money. Klopp's fortification of Anfield by reinvesting the money received for Philippe Coutinho to buy Virgil van Dijk and Alisson Becker has proved to be a masterstroke.
Klopp has led Liverpool to the Champions League title and two exceptional Premier League campaigns, one of which saw them win the competition after 30 fateful years. Following these achievements, it is safe to say that Klopp has triumphantly restored the once fallen giants to the pinnacle of both English and continental football.
#2 Rafael Benitez to Zinedine Zidane (Real Madrid)
Zinedine Zidane was announced as Real Madrid's manager in January 2016, after the club endured a rather disappointing spell under Rafa Benitez. Los Blancos experienced somewhat of a slump after the sacking of Carlo Ancelotti. However, Zidane's arrival re-wrote the 119-year-old club's history.
In his first six months as manager, the former Ballon d'Or winner guided his old club to Champions League glory. He followed it up with another UCL title in his first full season at the helm. Zidane unbelievably upped it even further by completing the '3-peat,' winning his third successive Champions League title in his final year.
Zidane's impact at the club was so monumental that Real Madrid had to hire him for a second time in 2019, after failing to competently replace him. It is a true testament to his legacy at the club.
#1 Gregorio Manzano to Diego Simeone (Atletico Madrid)
Atletico Madrid's appointment of Diego Simeone as their coach in 2011 is arguably the highest managerial upgrade of the century, let alone a decade. The sheer consistency and longevity of his spell with Los Rojiblancos has been unrivaled in recent times.
The 51-year-old Argentine manager broke the Barca-Real supremacy in La Liga when his Atletico side romped to the title in 2014. It was their first Spanish championship in 18 years. He also spearheaded the Madrid-based club's re-entry into Europe, establishing them as regular participators.
Simeone's sensibility in the transfer market has been tremendous, especially considering the flashy amounts splashed by his rivals in each transfer window. His defensive masterclass has set a precedent for teams that are looking to deploy a conservative, yet effective approach to the game. Simeone's arrival at Atletico as their manager has truly changed the course of the club. He won his second La Liga title with the club last season and will be gunning to go for it once again.