going to wander back in time ..Clubs didnt have squads , They had a first team and a reserve team some had third team called an A team. The top reserve league had 22 teams the same number as the First Division. Players werent rotated and many played in every game. Injuries were much fewer and for example in one of their title winning years I believe Liverpool only used about 15 players. The need to rest puzzles me a little. The pitches are much better ,,,diet is better ,,,medical facilities are much better. I sometimes wonder if it is excessive training which is leading to an increase in injuries. International teams called up about 14 players for a game ,,and it was a rarity for anyone to drop out. I am not saying it was better in the old days but it can be interesting to look back .