Bayern have won the Bundesliga for the past six years since Klopp's Dortmund claimed back-to-back titles in 2011 and 2012.

Dortmund also lost the Champions League final to Bayern in 2013 and the rivalry between the two was intensified as Bayern picked off some of Klopp's best players in Mario Goetze, Mats Hummels and Robert Lewandowski.

"It's nothing, not a little bit personal," said Klopp on Monday. "There were never any negative things with Bayern but when we played them or when they bought our players how could I be happy and say 'Great, good idea I'll bring him in my car.'

"That was not nice for us at Dortmund but it's part of the business. In these moments I was not happy, but it is long ago."

Despite reaching four semi-finals and a quarter-final since 2013, Bayern have not added to their five European Cup wins since Arjen Robben's late winner at Wembley six years ago.

Liverpool also came close to adding to their five European crowns last season when losing out to Real Madrid in the final, but Klopp believes the fact his side are even considered contenders for the title now is a sure sign of progress since he was hired in 2015.

"The best thing of all the things we did so far since we are together is that we are a real competitor again. That is of course not enough, but it is a big step," added Klopp.

"Being not only part of the competition but people thinking we can beat Bayern, that's a big thing. The story so far is a nice one but not finished yet."

Liverpool have had 10 days to prepare for Bayern's visit, but despite the lay-off Klopp still has defensive problems to resolve.

Virgil van Dijk is suspended, Joe Gomez is sidelined with a lower leg fracture and Dejan Lovren faces a race against time to recover from a hamstring injury, so Joel Matip and Fabinho are expected to form a make-shift centre-back pairing.

However, Klopp is hoping the power of Anfield's famous atmosphere on a European night will give his side the extra helping hand they need to take a lead to Germany in three weeks' time.