Leeds manager Simon Grayson is confident his players will not fall at the final hurdle and miss out on winning automatic promotion from the Coca-Cola League One.
Grayson watched his side blow the chance to return to the second tier of English football after they failed to beat Charlton at The Valley. Millwall's defeat at Tranmere meant victory for Leeds would have seen them join Norwich playing in the Championship next season.
He said: "Our destiny is still in our own hands. I was disappointing with our game and with results going our way at Tranmere, but we have a great chance next week."
He added: "If anyone would have offered us the chance to win promotion on the last day of the season at home, we would have taken it.
"It will be some game next week. We will try to prepare and get as focused as possible because next weekend can change the club's destiny and future.
"I anticipated Millwall getting something but now it means we have one game to win. In effect, it is a one game season, but we have the determination to see it through."
Charlton manager Phil Parkinson was delighted with his team's resilient attitude and backed them to come through the play-offs and win an immediate return to the Championship.
"We know what is at stake and Leeds are still in the box seat but we are mentally prepared for the play-offs," he said. "We have a lot of big players and I hope that proves vital if we get through to the play-offs and then at Wembley.
"Football is all about dealing with the pressure and we have to go up [to Oldham] and go into the play-offs in good spirits. Mentally and physically we are ready for it."
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