Cape Town - Liverpool manager Jurgen Klopp fears his squad could suffer from burnout if the football season schedule does not change.
The Reds won the Champions League in Madrid meaning they played their final match on June 1 before a lot of the squad headed off on international duty.
Six players were part of England and Holland's squads for the Nations League, while Mohamed Salah, Sadio Mane and Naby Keita headed to the 2019 African Cup of Nations (AFCON).
Alisson and Roberto Firmino were at the Copa America with Brazil and are not due back into Liverpool training until next week along with Salah.
Mane, meanwhile, will not be back until after the Community Shield and Klopp is concerned about his players suffering burnout because of the fixture schedule.
"We sit here, and it sounds like I am having a moan or whatever. It is just the situation, in the long-term, is not acceptable," Klopp said in quotes via the Daily Star.
"For here (on pre-season) it is not a problem. We have all the boys here, apart from the three up front and Ali.
"It's not like after three days you can say to them 'Hey! Come on! Let's start running again!'. They have had a tough summer programme.
"It's football. It's not riding a bike, so you lose a little bit (of rhythm). It will all come back but it will be a tough start.
"In the future, we have to change that. We have to change it. It is not possible (to continue)."