How do you re-enter a player who has been substituted?

Answer 1

When a player has been substituted, he cannot be placed back in the game. The only time a player can stay in the game is if he is moved to another fielding position. The moment he is removed from the batting lineup, he is removed from the game. In the American League, the pitcher is not in the batting lineup, but the moment he is substituted on the mound he is out of the game.

Answer 2

No. A player who is substituted for cannot re-enter as a substitute.