Manchester City manager Pep Guardiola has stated that Liverpool, under the management of Jürgen Klopp, has been the toughest opponent he has faced in his coaching career.
Above all, we are demanding because the competition requires it; I think the pressure to win keeps us alert. If I didn't feel that way, I wouldn't even get out of bed. As for rivalries, Klopp's Liverpool was the toughest opponent I have faced in my entire life. Not only because of the way they play but also because it was very hard to counter it, which is why I attribute so much credit to my players.
Guardiola said, as reported by Mundo Deportivo:
Jürgen Klopp took over as manager of Liverpool on October 8, 2015. Since then, the 56-year-old coach has won seven trophies with the club. Under Klopp's leadership, Liverpool have claimed victories in the UEFA Champions League, Premier League, League Cup, FA Cup, UEFA Super Cup, and the FIFA Club World Cup. At the end of last season, Klopp left Liverpool and was succeeded by Dutch coach Arne Slot.
Recently, Klopp was appointed as the global head of football for Red Bull. In his new role, he will advise all teams owned by the brand, which includes RB Leipzig, Red Bull Salzburg, Bragantino, New York Red Bulls, and Liefering, on coaching strategies, transfers, and player development.