They said earlier in the window that they expected their squad to be dismantled and then rebuilt, but selling all the family silver isn't wise.Looks like Monaco selling Mbappe and Fabinho to PSG so i very much doubt they gonna let Lemar go too.They swimming in money too
Lemar also doesn't fix their glaringly obvious deficiencies in defence and goal as he'd be competing for positions where they're already strong.
As @killenefc mentioned, it's hard not to admire their front line but as you mention it's a marathon and not a sprint, which doesn't suit Klopp.
A top striker who can maintain his fitness and one or two resolute defenders and I'd be worried, but I'm not as they'll eventually tire and fade.