Owls caretaker manager Lee Bullen said his side can take plenty of confidence from their 1-1 draw with West Brom at the Hawthorns.
Atdhe Nuhiu put the Owls in front early on and when Jay Rodriguez saw red for Albion after an off the ball incident, it seemed the visitors would hold on for a third successive win.
But deep into six minutes of added time, ex-Wednesday midfielder Chris Brunt’s strike was deflected in off substitute David Jones to break the Owls’ hearts.
Bullen said: “It’s a sore one, before the game we would have said it’s a good point, but the players are desperately disappointed in that dressing room right now.
“To come to a club like this and put in that performance, work rate, togetherness was a big positive.
“The boys can take a lot of confidence, but we won’t get ahead of ourselves because that feels like a defeat and for Darren it will feel like a win.
“The league can kick you in the teeth when you think you are getting somewhere, but the players will be fully ready for Birmingham on Tuesday.”
Wednesday are now unbeaten in three games under Bullen, who is pleased the mood is high in the S6 camp.
He added: “Hopefully the last three performances have lifted everybody and we’ll see a big crowd at Hillsborough on Tuesday.
“There are over twenty games left and we want to finish as high as we can, we are heading in the right direction.”