Craig Gardner has described Sunday's clash with Tottenham as the biggest game of his career and admits he would give back his Carling Cup winners' medal to ensure Premier League survival.
Alex McLeish' Blues enjoyed one of the greatest days in their history when they beat Arsenal at Wembley earlier this year but they are now in danger of losing their top-flight status.
Birmingham are only above the bottom three on goal difference from Blackpool and Wigan, who visit Manchester United and Stoke respectively.
Nine-goal leading scorer Gardner insists he has never played in a more important match than that which lies ahead at White Hart Lane.
He said: "It's a massive game. Everyone wants to play in the Premier League.
"The Carling Cup win was fantastic and it's something we will never forget. To lift a trophy for the fans and the club after so long was fantastic.
"But this game is our career, it's bigger than the cup final and we need to go out there and give it every single ounce for this club.
"On a personal level this has been my first full season at Premier League level and it's been a great season for me.
"But I'd give up every single goal now just to stay in the league. In fact, I'd give my winners' medal back to stay in the league.
"If we end up in the Championship next season, it's a failed season for me.
"We owe it the fans, we owe it the gaffer (Alex McLeish). Everyone owes it each other to go out there and put a performance on."
Gardner believes a lengthy injury list has taken its toll on Birmingham but is confident they can obtain a positive result at Spurs.
He said: "To be honest, the injuries and suspensions have hit us hard in the last few weeks and I think we shouldn't be in this position.
"But look at West Ham, they've got a great team and they've already been relegated. It just shows you how good this Premier League is at the minute.
"It has been so tight all season and in the last few weeks we've been sucked into it.
"But we're good enough to get a result on Sunday. We are not going to roll over.
"Everyone has got the same attitude and we are going to go there on Sunday and give it every last little bit."
Who do you think will go down?
Wigan and Blackpool
Wigan and Birmingham
Wigan and Wolves
Wigan and Blackburn
Blackpool and Birmingham
Blackpool and Wolves
Blackpool and Blackburn
Birmingham and Wolves
Birmingham and Blackburn
Wolves and Blackburn