Warne takes the Millers to Cardiff where they have to win and hope Derby do not beat Sheffield Wednesday if they are to retain their Championship status.
Chairman Tony Stewart has already said that Warne's job is safe whatever happens in south Wales on Saturday and that he is the best man for the job.
But after a long and emotional season, and a possible third relegation at the helm, Warne will take time to think things through if they go down, but is already sure of the likely outcome.
“I think we will get to the end of the season and I think I am just going to have a couple of weeks' downtime,” he told the Star.
“It's great to have the chairman's support but I want to be the right person for the job and if I am not the right person for the job I want the club to do well.
“Fundamentally I am a Rotherham fan, I want them to do well but I am ambitious, I want to do well for my family.
“I will have a couple of weeks where I don’t think about football. I will be amazed if I ever come to the conclusion that I don’t want to be the manager of this amazing football club but that might be taken out of my hands.
“But at the moment, I enjoy the job, I give everything I possibly can for the job and I have the chairman's support currently, but I do know how football works.”
One potentially awkward moment will be avoided on Saturday as former midfielder Will Vaulks is suspended, meaning he can play no part in sending the club he left in 2019 down.
Warne added: “If he kept coming into our dugout to take his long throw-in he'd be getting so much abuse he probably couldn’t bear it.
“He has had his first child this week as well so he's had a big week and upsetting us wouldn't have been fair.
“He's done brilliant at Cardiff and has been linked to every club in the world. He is a great kid who deserves a great career and I am buzzing he is not playing.”