There is an earlier tread on this
had a player double drop twice in 3 weeks
keep in mind that the player didn't really drop a whole level
he dropped just a bit
if he was at 10 and dropped to 9 - than he was already 9.9
so his performance for the playoffs will not be that different
when you try to sell him however than people will only see his current level
only you will know that at 9 he's really really close to 10