The Liverpool ownership FSG will be having nightmares about what could have been if the club had signed German star Mario Götze back in 2016.
Ahead of Klopp's first full season in charge at Anfield, it wasn't surprising to see him linked with players he'd worked with in the past. One of those was Götze.
The world cup winner was at Bayern Munich at the time and his spell there wasn't going to plan having made only 14 appearances the season before.
The German giants wanted £30m for him but Liverpool were only willing to pay £15m - £20m which was well below what Bayern paid for him.
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Götze was keen to move away from the Allianz Arena at the time and eventually opted for a move back to former club Dortmund instead of reuniting with Klopp in the Premier League.
His best years were during his first spell Signal Iduna Park, where he'd been described as "special" by reporter Liam Twomey and was a key part of Klopp's success there.
In his second spell at the club he made 103 appearances and was involved in 31 goals, before eventually moving to the Eredivisie where he now plays at PSV Eindhoven.
Overall his career hasn't been bad by all means, he has won the Bundesliga five times and most famously the World Cup in 2014 where he scored the winner in the final for Germany.
His legacy will forever be remembered because of that. He was so young at the time and achieved everything every young boy dreams of, so why at 29-years of age are we not talking about him being one of the best midfielders in the world?
Well, he's had his fair share of injuries and ultimately it seems as though he peaked at a young age. You can't blame him for moving to serial winners Bayern at the time, but just how good could he be now if he had followed Klopp to Merseyside?
He seems to think he would have been better for it. In a recent interview cited by the Mail he revealed how he "should have joined Liverpool" and that manager Klopp had the biggest impact on his career.
Not many players have had the privilege of playing under both Klopp and Guardiola but Götze is one of them. Could he still potentially join Liverpool at some point in the future?
He's been performing well since moving to PSV with 17 goals and the same number of assists in 71 appearances, however, he isn't at the level required for a Liverpool player.
He won't regret much in his career given everything he's won, but in the back of his mind, he may always think about what could have been if he had made the bold decision to move to England.