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Gillingham will be without a game on Boxing Day after scheduled opponents Peterborough entered a period of isolation.
Gills were due to host Posh behind closed doors at Priestfield on December 26. The game would have seen Gills boss Steve Evans come up against one of his former clubs.
But it is one of three League 1 games involving Peterborough that have been postponed after a player tested positive and three further players showed symptoms
The EFL statement read: "Peterborough United’s next three Sky Bet League One fixtures against Ipswich Town (Saturday 19 December), Gillingham (Saturday 26 December) and Charlton Athletic (Tuesday 29 December) have been suspended.
"The club informed the EFL that they would be unable to fulfil the fixtures following a recent positive Covid-19 test and the requirement for players and staff to self-isolate for 10 days as per EFL and Government guidance in order to mitigate against the risk of further infection.
"The circumstances surrounding the postponements will now be the subject of an investigation in accordance with EFL Regulations.
"Revised dates for the rearranged fixtures will be confirmed in due course."
Gills are in League 1 action on Saturday when they visit Rochdale.