The Gills have won their last two games without conceding goal and named the same starting XI for both games, but Allen has claimed that he will make changes for the fixture that would see his side knocked off top spot with a defeat.
Top scorer Danny Kedwell - who has 11 goals in all competitions - could be recalled to the side as he looks to find the net for the first time since November 3.
Steven Gregory could be handed a full debut after signing from Bournemouth at the beginning of the month, while Charlie Lee and Charlie Allen are other midfield options.
Striker Ben Strevens is still in Allen's thoughts despite being made available for transfer and could be in the squad.
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