Shields head to Warwickshire for the first leg with a couple of injury doubts, after Gavin Cogdon, Carl Finnigan and Darren Holden picked up strains in their Durham Challenge Cup semi-final win at Consett last week.
Arca started on the bench that game, while Jon Shaw, Wayne Phillips and Craig Baxter were also rested.
A number of players took their chance to impress against Consett as the management duo rotated the starting XI, but whatever side they pick tomorrow, Arca believes it is more than good enough to progress thanks to the strong team spirit in the ranks.
He said: “We’ve got the team and we believe we are capable of doing it.
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“We have to go there and hopefully get a good result. It won’t be easy though as they have got to the semi-final for a reason, but the team is confident.
“The good thing is that we have got a big squad and a good squad. We showed that away at Consett last week on a cold, Tuesday night.
“Some of the players hadn’t played for a few weeks but they started the game and played really, really well so that shows how good the squad is.
“It’s hard for the managers now to make the decision as nearly everyone is fit and everyone wants to play in this type of game.
“But it’s good to have everyone fit and helping, pushing the same way, and that’s why we are where we are.”
Anthony Callaghan is cup-tied for the game.