Can you do this?

[DaveASA/FED]

I think what you are asking is an unreported substitution and/or illegal substitution. If as cecil says there was a dp involved then you could have done this. IF the DP went into the game on defense for the injured player then you would have been fine (if injured player was flex then they left the game, if not then noone did anything) but from your description they would NOT have been the flex due to your comment of taking an out in the batting order.

So if you put a player that had been in the game in another batting position into the game for a player that was injured the answer was NO that is NOT legal! Please give a few more details and we can give you an exact answer.