Ex-Owls goalkeeper Damian Martinez could feature against his former club this afternoon.
The Arsenal youngster joined Rotherham yesterday on an emergency loan and could be thrust straight into derby action against Wednesday.
Miller boss Steve Evans said: He has joined us on loan until the end of the season and will now compete with Adam Collin for the number one spot.
“In fairness to Adam Collin he has seen many challengers for the jersey come and go but it has to be said none of the quality of big Damian so let the battle begin.”
Martinez signed for the Owls on a temporary basis last season and started 11 games.