Still unable to call upon new signing Daniel Pinillos as his international clearance has not been obtained, Freedman slammed a lack of defensive 'desire' in his side as they shipped four goals to the League One visitors.
He also told the official NFFC website that the problems at the back have changed his transfer deadline focus from attack to defence.
"The priorities have now changed from bringing in a flair player with cutting edge to identifying what I need to have some desire at the other end."
Rotherham are the first league visitors to the City Ground on Saturday afternoon and will be looking to bounce back themselves from a disappointing home defeat to MK Dons on the opening day of the season.