Of all the questions, of all the conundrums with which Jurgen Klopp has had to grapple since sweeping into Liverpool almost four years ago, the most pressing is also the most perplexing.
How do you improve on near perfection?
Having been crowned European champions and claimed a club-record Premier League points total, last season hit heights that even the most successful previous Reds teams will have struggled to match.
There is, of course, always room for growth, the absolute pinnacle forever in sight but never quite reached.
And that's why certain Liverpool supporters, while revelling in the Champions League glory of Madrid, have started to grow restless.
Transfers, or rather the lack of them, have replaced that sixth European Cup as the chief talking point, concerns the Reds are being left behind as their rivals splash the cash in pursuit of closing the gap, whether that be home or abroad.
Klopp has been consistent in his belief Liverpool wouldn't come close to replicating last summer's spend of more than £170million.
And speaking exclusively to the ECHO during the club's ongoing US tour, the Reds manager has addressed how the triumph of last season has made strengthening the squad a difficult task.
“It's not easy,” says Klopp. “I said last year that to improve the team is not easy with reasonable money. With crazy money, you always can do it – okay, you pay whatever you want, then it's possible.
“We are not a club like that. We cannot do that. We are really wealthy but we cannot do what some other teams are doing. That's how it is.
“But we don't have to. We have to find solutions during the season. Yes, you find sometimes the solution in the transfer market and we have done that. I don't have to name the players, everybody knows.
“But otherwise you have to find the solutions on the training ground and that's what we do now.”
Liverpool 'still looking' for transfers
Nicolas Pepe of Lille and Nabil Fekir, now of Real Betis, are two of several players strongly linked in recent months but with whom Liverpool have no interest.
Their only business so far has been the £1.3million spent to take 17-year-old Dutch defender Sepp van den Berg from PEC Zwolle.
Klopp is looking to introduce at least one more new face, with versatile defensive cover on the flanks a priority having been interested in England under-21 right-back Lloyd Kelly before the Bristol City man's move to Bournemouth.
But even if the purse strings remain closed, the Reds boss is convinced he already has the squad to launch another attempt at the Premier League and Champion League.