Gills are set to welcome Millwall to Priestfield on Saturday for their first pre-season friendly.
The game at Priestfield is a 1pm kick-off and it will see Mark Bonner take charge of the team for the first time following his appointment in May.
The two clubs regularly play each other in the off season and the game will see a return to Priestfield for Neil Harris who took over at the Den for the second time earlier this year, having left the Gills in October of 2023.
David Livermore and Adam Barrett are among the staff at the Championship outfit.
The teams last met in a competitive game in August 2018 when, following a 0-0 draw in the Carabao Cup at the Den, Millwall prevailed 3-1 on penalties.