Tickets are now on sale for the Checkatrade Trophy match against Arsenal Under-21s at the Jonny-Rocks Stadium (October 30, 7.45pm kick-off).
The Gunners will appear for the first time in the competition and are one of 16 Category One academies drawn with League One and League Two clubs.
Prices have been heavily reduced to only £5 for adults and £3 concessions (Over-65s, Under-18s and students).
There will be unreserved seating in all areas on the night in either the AutoVillage or Hazlewoods Stand, plus standing in the Paddock. Travelling fans will be housed in The Colin Farmer Stand.
The Robins lost 4-0 at Forest Green Rovers in their opening game of the competition last month and will face Coventry City in their final Group E match on Tuesday, November 13 (7.45pm kick-off).
Per Mertesacker, a World Cup winner with Germany in 2014, is the current manager of the Arsenal Academy and works alongside Freddie Ljungberg.
The decorated winger and former Swedish international is the head coach of the Under-23 side.