Jersey coach Ben Harvey has warned against complacency ahead of the the 2011 Siam Cup against Guernsey.
Jersey comfortably won the cup last year, beating their bitter rivals by 36-0 at Footes Lane.
Harvey told BBC Jersey: "Guernsey have had a very good year, they've got promotion and I don't expect anything but a very hard game.
"So we need the support enormously, the lads need the support and it's a cracking atmosphere up there."
Jersey go into the game having enjoyed an extremely successful domestic season in National Two South.
Having finished runners up to Ealing Trailfinders, Jersey face a play-off against the second-placed side in National Two North for promotion into National One.
"You've got to keep on a roll," said Harvey. "We've been on a roll since Christmas where we've not lost and we've worked really hard to maintain that record.
"It's not been easy so a loss would set us back in a major way.
"I just feel that if our lads go out and perform and do things that we've practiced then they'll win the game."