The Light Blues head into the encounter off the back of what was a frustrating night at Pittodrie as they squandered a 2-0 lead to draw 2-2 against Aberdeen.
Gers' draw with the Dons means they are now two points behind Celtic in the Premiership title race, after the Hoops managed to secure a late win on home soil against Hamilton.
Manager Steven Gerrard and his Rangers side will need to dust themselves down quickly from Wednesday's setback as they prepare to head to Hampden Park to face arch-rivals Celtic.
With his side looking for their first major trophy in eight years, Scotland international Jack feels Gers will go into the final with no fear and says they are more than capable of overcoming the Hoops on the big stage.
"We've shown before that we can compete at that level, domestically and in Europe so there's nothing to fear," he said. "We have beaten Celtic before but we can't really take that for granted because it's a totally different game.
"It's a cup final and a trophy is at stake so it's a wee bit different on that front. The supporters are desperate and we are as well.
"We're hungry. It's important that we go and play and show how hungry we are."