The Sky Bet Championship clash sees a club newly-promoted to the division this season in the hosts come up against one in the Latics who last term were in the Barclays Premier League and won the FA Cup.
As a consequence of their cup run, Wigan have been competing in the Europa League and they head into the Yeovil match off the back of Thursday's 1-0 Group D defeat in Russia at Rubin Kazan.
Johnson is in no doubt that his team, who are currently bottom of the table, have a tough task ahead of them on Sunday.
But he feels they have acquitted themselves well against some prominent Championship sides this term and with every faith the Glovers can win this contest, is very much looking forward to seeing how they fare.
Speaking at his pre-match press conference, Johnson said: "We are excited about the Wigan game.
"If you are playing the FA Cup holders and a team that have just flown back from Russia having played in Europe, and who were in the Premier League last year, you've got to look forward to that.
"It is a game, again, where we are not expected to win. Only we expect ourselves to win the game - the bookies won't - and we have to try to see how close we are to this sort of team.
"We have proved we are close to Nottingham Forest, Leeds, QPR, Reading, Leicester.
"We have played all of those top teams and proved we are, on occasions, on a par with them, other than scoring the goals.
"That just seems to be the difference and will hopefully break soon."
Asked about whether Wigan, whose first XI for the Rubin match showed six changes from their 2-1 Championship victory over Huddersfield last weekend, might show negative effects on Sunday from the travelling the squad have had to do, Johnson said: "We hope so - that would have to be a positive for us.
"But I'm sure (Wigan manager) Owen Coyle has thought about that, and on Thursday he didn't play some of his lads who have been regular players in the Championship.
"They have a group of quality players - whoever has been rested, whoever plays, they are all top players."
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