On-loan Crystal Palace striker De Silva was sent off two minutes from the end of Friday's goalless draw against Dagenham, while defender Fuller was shown a red card after the final whistle.
Winger Keanu Marsh-Brown could be added to the squad having joined as a free agent last week after leaving Yeovil.
Veteran goalkeeper Michel Kuipers, who also signed on Thursday, should be on the bench with Sam Cowler and Liam O'Brien out injured.
Steve Kabba remains sidelined by a knee problem and fellow striker Ricky Holmes is out for the rest of the season due to a foot injury.
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