Gavin joined the National llist of Assistant Refs in 2002/3, progressing to the National List of Referees in 2007.
Gavin stood in a Millers game for the first time just over three years ago in December 2007 where he sent off Wrexham's Matty Crowell as goals from Derek Holmes (2) and Marc Newsham saw off the visitors to Millmoor 3-0.
Ward was the ref who called Barnsley's game at Plymouth off after an hour last season with the visitors 4-1 to the good in torrential rain, with former Millers manager Mark Robins none too happy.
Gavin has been in charge of 19 games this season, showing 49 yellow and just the 2 red cards.
Running the lines will be Mr. C Knowles from Northants and W. Linden from Middlesex.
The Fourth Official is Mr.R Mackay from Bedfordshire.
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