[Philadelphia Freedom]

I know you can't retroactively insert a player that has played however with the Steelers playing night (and having both Big Ben and Batch) is there any flexibility in my changing my mind up to the start of that game on Monday night. I am not sure if the rules address this (though I am sure if they do someone will point it out with the appropriate section) but I would prefer not to pick the guy that does not start (not that the other guy might not get into the game anyhow). Any help/guidance would be appreciated. Thanks!