Yeovil have lost just twice in their last ten fixtures and are now three games unbeaten despite goalkeeper Kasper Schmeichel’s last minute header for table-topping Leicester stealing victory from the Glovers at the King Power Stadium on Tuesday.
Going into the match against the Tykes both sides are level on points and Johnson is keen to not understate the magnitude of the fixture which may go some way to deciding Yeovil’s Championship fate.
“It is one of the games where we would be really disappointed if we don’t get a full house because that is like the play-off final for me, it's that important at this stage, so I know you use words like 'urge the supporters' but we need a big gate, not for the finances, but for the support.
“We need an afternoon like when we played Sheffield United (in the Play-Off Semi-Final) because what the boys have done in the last month or so and on Tuesday they deserve that support and I'm sure the Yeovil fans will come out in force.”
Although Yeovil have picked up just three points in their last five matches the manager is adamant there is still everything to play for as the season reaches its conclusion.
“There are eight games left and there is still everything to play for,” said Johnson. “There are some games that some of them are going to win and I think we're all on the same points, the bottom three, and Charlton have just pulled ahead a bit.
“Barnsley haven't pulled away yet though because we've got to play them and they have some difficult games coming up, that just shows you how you have got to have the momentum going in to the last few games of the season, that's really, really important.
“You've got to have a game where the boys are giving everything and that's what they are doing. If you take winning or losing out of the equation you’ve got to do your best and that's what our boys did on Tuesday.”