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Championship side Millwall will visit Priestfield in July for a pre-season friendly.
The match takes place on Sunday, July 21, kick off 1pm.
It’s the first pre-season game that the Gills have confirmed since the appointment of manager Steve Evans.
That game comes two weeks before the opening fixture of the season, on Saturday, August 4.
League fixtures will be announced on Thursday June 20.
The Gills have, meanwhile, cancelled their pre-season match at Margate, which was due to take place on Saturday, July 13.
Folkestone Invicta have advertised that a Gills team will be playing them that day.