Is a return to Anfield for Philippe Coutinho a possibility?
Liverpool sold the Brazilian to Barcelona for a fee of up to £142m in January 2018. But Coutinho's time at the Nou Camp has been far from plain sailing.
He posted a number of disappointing performances and was eventually loaned out to Bayern Munich.
Indeed, last season saw Coutinho help Bayern win the competition - helping knock out his parent club along the way.
Despite impressing in Bavaria, the German champions decided to not extend the deal and Coutinho returned to Catalonia with his future up in the air.
A return to the Premier League was on the cards with Arsenal and Chelsea interested but Liverpool were also linked.
Ultimately, he remained at Barcelona where he has won over the trust of Ronald Koeman - but he has admitted a return to the Premier League is possible.
Klopp has already been asked this question last season when the rumours about an Anfield return were rife.
"I really respected Phil's switch from the first second," the German told the Pure Football Podcast at the time.
"Not that I do that all the time but it felt oh wow that could be difficult.
"So it's not about yes we signed a new contract so many weeks before that but it was really clear he would not have asked me for any other club but for this club, there was no chance.
"Then we had to be hard in the summer because we had no other solution. We lost Adam Lallana [to injury] in that time as well, we would have lost two players.
"That's not possible, you cannot solve that on the transfer market.
Get all the latest Liverpool injury and team news as Klopp faces selection dilemma, plus breaking news and analysis of what's next for the Reds.
You'll also get the latest transfer talk and analysis straight to your inbox every day with our FREE email newsletter.
Sign up here - it only takes a few seconds!
"He was open to that [staying] and that was really cool. Then you have to be fair in the window and say we can do it, we don't like it but we can do it."
When asked about a possible return, Klopp added: "Phil was our boy for a long time. We respect him a lot and wish him all the best.
"That's how football should be. That's the most important thing the club showed in that moment."