Webster922 wrote:
You can sign the player without dropping another if you're going into a midweek stage. You then drop a player going into game day. If you're going into game week while trying to sign a player, you must drop a player as well.
... or the AI will drop one for you, probably your most recent first round pick!
(This actually happened to me. The AI cut my 1st, 2nd and 3rd round picks because I was over the limit for training camp. Of course they were quickly scooped up by other owners.)