Birmingham striker Kevin Phillips has called next Sunday's trip to Tottenham "a £90m game" as the Blues try to avoid relegation from the Premier League.
City need to at least match Wigan and Blackpool's results to stay up after losing 2-0 at home to Fulham.
And Phillips said: "They talk about the Championship play-off final being worth £90m, there's three Premier League games next week worth as much as that."
West Ham were the first top-flight side to be relegated this season after losing 3-2 at Wigan and they will be joined in the Championship next season by any two of five teams.
Birmingham, Blackpool and Wigan are all level on 39 points, with the Blues having a marginally better goal difference, while Wolves and Blackburn, who meet at Molineux on the final day of the season, are on 40 points.
"We know what we've got to do," continued Phillips. "I have been in this situation a couple of times before and we need the experienced players to come to the front and everyone to perform at White Hart Lane.
"I feel sorry for the supporters. I can only apologise."
Birmingham have been in freefall since winning the League Cup at the end of February, winning just two of their 11 league games since then.
But boss Alex McLeish said the equation was straightforward enough even if the task may not be.
"We are in a dogfight," he conceded. "It's come down to one game. It's quite simple.
"The stakes are enormous and we know the consequences of going out of the Premier League.
"But it is what it is and we will come back in on Tuesday and work out how we go to White Hart Lane and beat Spurs."
Midfielder Craig Gardner and defender Liam Ridgewell will be available for McLeish after being suspended for the Fulham defeat.
"It has hurt us badly losing those two," admitted the Scot. "Suspensions and injuries have hurt us and we are down to the bare bones."
Meanwhile, Mark Hughes was encouraged by his side's third away win of the season, and second in succession after beating Sunderland 3-0 a couple of weeks ago.
"I'm very pleased," he said. "It was important we showed intent about what we want to achieve from our season.
"We had a difficult night against Liverpool on Monday but I got what I wanted from the team; we started positively and quietened the crowd and that was to our benefit.
"We took the game to Birmingham and created a number of chances.
"Everything we had talked about we executed and it could have been more comprehensive - perhaps that is my only criticism, that we didn't take all our chances.
"Not many teams come here and get positive results but we made it quite comfortable.
"We've improved our attitude on the road, we try to take the game to the opposition and we are improving.
"We are always solid at home, so if we can build on our away performances next season we can establish ourselves in the top 10."