The Merseyside club booked a spot in the final against Chelsea following a 2-1 win over local rivals Everton on Saturday.
While the highly anticipated May 5 clash is looming, the England international has admitted that Liverpool's current focus is this weekend's match against West Bromwich Albion.
"The preparations will be the same as usual," Johnson told TheFA.com. "We've got a game on Sunday against West Brom so we've got to enjoy the win and then we'll look forward to that game before the final.
"We need to take every game as it comes and we've got a few more games before [the FA Cup final]. It's going to be there in the back of people's minds. Hopefully we can pick up another trophy."
Despite a positive cup run, Liverpool have had a dire league campaign, clinching just five home wins all season.