Although it is a slightly unusual situation to face a team from the same division during pre-season (outside of Premier League teams on overseas tours), the fixture was arranged before Rotherham's promotion and the two sides don't then meet each other until a league game at the same venue in mid-December.
The Millers have been busy in the transfer market as they look to consolidate their place in the second tier of English football and new signing Matt Derbyshire will be keen to make an impact against his former club.
In transfer news the Reds have been strongly linked with a loan move to sign Crystal Palace's 23-year-old right-back Jack Hunt in time for the weekend trip to MK Dons.
***Update*** Hunt has signed a deal until the end of 2014.