Xabi Alonso has described Bayern Munich's battles with Jurgen Klopp's Borussia Dortmund side as 'immense', and the Spanish midfielder confessed that the German coach's style of play would 'almost break' him.
Alonso was part of the Bayern squad from 2014 to 2017, and the former Liverpool man won three BuLi titles during his time in Germany.
Der FCB's reign at the top of the German first division did not come without its challenges however, and as reported by The Athletic, the World Cup winner looks back on Klopp's Dortmund team with respect, admitting that he 'didn't enjoy playing against them'.
“I suffered. It was like he [Klopp] wanted you to be in a cage. He wanted to trap you. His Dortmund was waiting to get you in that square behind the strikers and in front of the midfielders.
"There was an organised pressure. Their strikers involved wingers but they did not play like proper wingers. They would run infield and try to steal the ball from you. I was under pressure all the time.
"I enjoyed the mood around those games because they were so important but the challenge of beating Dortmund was immense.
"I didn’t enjoy playing against them because they made it so intense, you’d almost break.”
Klopp managed to win back-to-back Bundesliga titles with Der BVB from 2010 to 2012, temporarily knocking Bayern off their perch at the top of German football in the process.
Following his departure from Dortmund, the German boss took the reins at Liverpool and guided them to Champions League success last season, as well as missing out on the Premier League title by a single point.
Klopp will be desperate to bring domestic glory back to Anfield, and the 52-year-old is well positioned to do so, as the Reds sit top of the league with an eight-point cushion, following their 3-1 victory over Manchester City prior to the international break.