Selsey won the John O'Hara League Cup for the first time in their 100-year history on Good Friday, but it could also be the last according to manager Danny Hinshelwood.
Two second half strikes from Paul Lee was enough to see off Sidlesham, but Hinshelwood fears his side may not be around next season to defend the trophy unless the club gets more support behind the scenes.
He said: "There are a lot of things to be sorted out before we can look ahead for next season. The club is in a bit of trouble in terms of people helping out and it could be touch and go whether there is a club next season the way things are going.
"You go to some clubs and they have ten people helping out, but you come to ours and there are only three or four and it's becoming a major problem."
Hinshelwood is hoping the cup win, Selsey's second in two years after they won the RUR Cup last season, will stimulate interest in the club.
He added: "We need three or four people who love football to come in and want to work at the club. Hopefully things like winning the cup will kick-start a few people in the village who want to be involved in a good side with good players to ensure a good future."
Despite Selsey's uncertain future, Hinshelwood is planning to enjoy the cup win.
He said: "I'm really pleased with everyone because nobody expected us to win.
"We will probably be out until the early hours celebrating this and hopefully we will do well in the remaining games so we can have a good end to the season."
For Sidlesham, it was the second time in three seasons that they had fallen at the final hurdle after losing to Sidley 3-2 in 2001.
It started to go wrong after just 26 minutes when 22-goal striker Scott Tipper broke his ankle following a heavy challenge by Matt Stilman.
Sidlesham manager Richard Towers said: "It was a big blow because he is important to us and the way we play. To hear that he has broken his ankle when he went down is even more of a dampener. He's self employed as well so it will affect him in his work, so our thoughts are with him at the moment."
Even without Tipper, Sidlesham had enough chances to win. Three of the best opportunities fell to the ideal man in Richie Davies who has hit 30 goals this season.
First he rounded the keeper on 32 minutes and tried to squeeze a shot in from a tight angle, but covering defender Marc Hinshelwood had made it back in time to clear off the line. Then five minutes after half time he elected for precision rather than power and his delicate chip over Selsey keeper David Leaver went harmlessly over the bar.
It was the same result on 77 minutes when he sent clear by Glen Bridgman, but his attempted lob was too high.
Sidlesham were made to rue the missed opportunities on 64 minutes when Selsey took the lead with their first shot on target. It came via the penalty spot after Derek Chester had been tripped by Ben Johnson and Lee coolly converted.
Their second shot at goal was not too long in coming with Lee doubling the advantage six minutes later with a superb finish past Sidlesham keeper Steve Judd. He anticipated the bounce of a long ball over the top to beat the offside trap and powered home a volley from the edge of the area.
Lee said: "Me and Juddy go back a long way so it was great to knock a few past him."
Selsey: Leaver, S. Hinshelwood, M. Hinshelwood, M. Lee, Stilman (sub A. Davies 65), Rishman, Chester (sub: Hurst 88), Morey, Reed (Moore 85), P. Lee, Bines.
Sidlesham: Judd, Jones, S. Towers, Bridgeman, Latter, Johnson (sub: D. Towers 85), Wozniack, D. Towers (sub: Reed 85), Tipper (Grantham 26), R. Davies, Brown.
Referee: Lee Bonaldi (Hove).
Attendance: 348 Rye remain on course for a second successive league and cup double after a fully deserved 1-0 victory over Westfield in the Division Two Cup Final.
A hotly disputed penalty by Shaun Loft 16 minutes from time proved decisive in a game which Rye had the better of throughout without creating many chances.
Andy Moore was harshly adjudged to have clipped the heels of Steve Smith and Loft sent Paul Worthington the wrong way from the spot.
Dave Williams missed the best chance of the first half when he fired over from ten yards, but Westfield did have a few moments of their own. Rye took complete control after the break, though, as Westfield resorted to the long ball to clear their lines.
As Westfield pushed on in an attempt to salvage something late on, man of the match Nathan Godden headed against the bar.
Division Three Cup final: Midhurst 1 (Gibson 62), Crowborough Athletic 0 (at Horsham YMCA, attendance 361).
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