Checked with MLB earlier today. Here is what I was told by spokesman Pat Courtney:
If it is determined that the actions of any of the personnel involved in the incident warrant a suspension that suspension would have to be served during regular season games. There have been multiple regular season suspensions in the last several years that were issued as the result of incidents during Spring Training.
So if MLB suspends Shelley Duncan or Joe Girardi, they’ll sit when it counts. Because warnings were issued before the game, it’s likely there will be some sort of punishment. It could be a fine or suspension or both.
How odd would it be for Girardi to be suspended for his first game as Yankees manager?