''Somebody has to be accountable," Cash said, before issuing what appeared to be a veiled threat ... "The last thing I'll say on it is I got a whole damn stable full of guys that throw 98 mph. Period.''
For his part, Yanks manager Aaron Boone called Cash's words "pretty scary," but didn't elaborate much more on the incident after the game.
On Wednesday, MLB hit Chapman with a 3-game ban for his role in it all, saying straight up he "intentionally" threw at Brosseau.
MLB also suspended Boone and Cash 1 game for their roles.
All three are slated to serve their bans beginning Wednesday night, MLB officials say ... though Chapman has a right to appeal.