The Owls boss is keeping his squad guessing after making his threat ahead of next Saturday's home match at the Ricoh Arena.
"Nobody is invincible," he told the Sheffield Star. "This is an opportunity where I could make changes.
"No-one can have any complaints if he is left out. All the team set themselves up for criticism with the performance at Derby.
"But for some players - those trying to get into the side - there is a bit of light at the end of the tunnel."