IIRC there was a US owner that got screwed by this last season. I could be wrong but you are going to have to pay his salary tomorrow so why not just wait one day before listing him.
Yes. Actually, you can even have a player sold before the game begins as long as it's after the lineups are locked in, which is 15 minutes before the game. So if your player sells at 7:50 and your game starts at 8:00, the player will actually still play.
Usually that's not a problem but generally game 3 of a finals series is not the time to be open to risk. (j)