Klopp is really taking a risky move by selling their two veteran midfielders, it's similar like Chelsea. Although the performance of both Chelsea and Liverpool in club friendlies are good enough, but we don't know what will happen in the real match.
Chelsea and Liverpool lack of midfielders.
Manchester United lack of strikers.
Are the comparison of the three teams(Chelsea, Liverpool, and Manchester United) based on the weaknesses in their squad from the previous year? Both of the three teams lack the things you listed, but I believe that by adding fresh, high-quality players to their teams, things will start to improve.
Chelsea and Manchester United have no doubt taken the necessary steps to sign the players they require to fill the gaps in their team, but I am unsure of what Liverpool's coach and owner are up to. Whether they will sign additional players to their team at late hours.
I was impressed by Chelsea's new striker additions during the current transfer window as they participated in the preseason match that resulted in their first season-opening trophy.