Swapping players between days

So for my fantasy team I have both Impact and Moon. They aren't going to be playing on Saturday which is fine. I can easily pick up Cris and Shrimp for that day. Will I be able to swap Cris and Shrimp back from Moon and Impact since they are going to be the ones playing on Sunday. Only being able to have my players in two of my slots getting points for only one day of LCS whereas my opponent won't have this issue seems to be slightly unfair.