Pulborough have conceded their derby fixture against holders Horsham in the quarter-final of the Bob Rogers Cup on Saturday.
The local rivals were set to meet at Coolhurst in the last eight of the competition.
But player availability issues from Pulborough have meant they have conceded the chance of a local derby.
Boro captain Simon Burfiend said: “We were supposed to be playing Horsham in the cup, however with our main focus being on the league this season, and with key players in key positions being unavailable - as it should have been a rest week so plans have been made - it would not be fair to detriment the success of the other Pulborough sides to fulfil a fixture against Horsham in the cup.”
Horsham’s next fixture is away to Deal & Betteshanger who presently lie third in the table on March 19 - while Pulborough host Folkestone.