clan war list/chosen

I have my own clan and most of us are very active, but some are not. is there any other way that I can only choose or select who are able to play on clan war? Like even my #2 player are strong but there's the day that he/she can't play on clan war so I have an option to count him/her out on that clan war. I don't like kicking player out of my clan cause their my friends and sometime they busy at work or school.
If it's possible only leader and co-leader are able to select who are going to war. Tnx.