@Der_Ryan_M is correct
Day one injury was recovered and had 99% condition

Click image for larger version.  Name: DAY 28 INJURY 2.jpg  Views: 45  Size: 50.0 KB  ID: 119488

* and here just to remind an old suggestion.
As the players have 99% condition at day 1 of the season, should also have a full morale (not to mention the injuries too).
For the realism of the game, it's a new season that starting with full hopes, players are still members of the club and had some physical and mental "resting" .