Andy Haines from Tyne & Wear.
Andy was in charge of two games at Don Valley last season that both ended in defeat, as the Millers went down 1-0 to Burton and then 2-1 to manager Steve Evans' old club Crawley Town.
In 14 games so far this season, Andy has shown 37 yellows and just the one red card.
Running the lines on Saturday are Mr. S. Meredith (Nottinghamshire) and Mr. D. Gratton (Staffordshire).
The fourth official is Mr. A. Greenwood (North Yorkshire).