Both Steve Evans and Richie Barker will be facing their former clubs when Rotherham travel to Crawley Town on Saturday.
Town boss Barker spent four seasons as a player with the Millers, making 140 appearances and scoring 12 goals between 2001-04.
He said: "I had some good times there, including scoring a last-minute winner against Sheffield Wednesday at Hillsborough which, as you can imagine, was very popular with the Rotherham fans.
"They have been in the shadow of the two Sheffield clubs and to a certain extent Barnsley, but they have real momentum since their new stadium was built and have a very ambitious chairman."
Evans spent five years at the Broadfield Stadium and guided Town to promotion to the Football League in 2011.