Unejection Mechanic

[canadaump6]

Okay guys, I've got a double header tomorrow doing some of the best players in Ontario. This is my first time doing this level, and I'm worried that I might get a bit trigger happy and eject someone before I've really thought it through. I think it would be best to learn the mechanic for unejecting someone, unlike the other time when I just said to the coach "you're back in the game". Can someone please tell me what the standard unejection mechnic is? Thanks.