The fact that we're proceeding with internationals to Brazil when we're in the midst of a global pandemic tells you all that you need to know about the house of cards on which top level professional football is built.
Players were already at, if not beyond their limits in terms of the number of games they were playing pre-COVID. Klopp made this point on a number of occasions.
There should be a limit to the number of games a professional footballer can play for club and then for country in a calendar year, with a guarantee of 4 weeks holiday.
Instead we're now seeing 3 games during an international break being fazed in (the pandemic seems to be a precedent for even more games).
Therefore, potential international schedule going forward:
September: 3 games, October 3 games, November 3 games, March 3 games, June 3 warm up friendlies for Euros/World Cup, June/July 7 games Euros/World Cup
Players can play around 20 international games a year now. Then throw in 60-70 club games in a club season. Pre-season friendlies where they've gotta go all over the world, Club World Cup that's coming.
You're looking at the best part of 100 games a year that a player's club and country can play and he gets a token 2 weeks off in the summer with no pre-season from summer tournament to the start of the Premier League.