The Eagles take on Watford at Wembley with the winner gaining qualification to England's top flight and the Australian midfielder feels it will be a tightly fought contest, especially after both sides semi-finals exploits.
"Both teams won their respective semi-finals in dramatic fashion and it's going to be evenly poised," Jedinak said.
"If we're going in as underdogs then so be it, but in my mind it's 50-50.
"We've got a plan we will be working on and hopefully we can execute it the way we did at Brighton."
He added: "There is a big wall in the way called Watford and we are expecting a very tough game, we are going to have to earn it on the day.
"We have some great characters in the dressing room and in the team, they've been a real joy to work with.
"The success we have shared so far has held this group together but we have a job on our hands to get to where we want to be."