When a player arrives to CA7 (GK CA5'5) coach is unusefull for him, so you can use the place of that coach for another player under CA7. In this way you will not need so much coaches, decreasing week wages.
Another thing to do when a player arrives to CA7 (on GK to CA5'5) is change training to ligth, in this way you will reduce his nigth injuries to none.
Cheers!!.