Warnock's men host Sheffield United on Sunday and, if the Eagles deny the Blades at Selhurst Park, Reading will win automatic promotion should they beat Birmingham at home.
"You always depend on the integrity of this league and I always depend on it," Coppell told the club's official website.
"I know Neil felt hard done by in the Premiership when other teams didn't field their strongest team in critical games and he ended up relegated, he's very mindful of that.
"We are depending on another result, we can't do anything about it so we just concentrate on ourselves.
"It's a no-lose situation," he continued. "It's marginally more than a dog's chance but we're happy to be here and we've got the back-up of the play-offs if it proves necessary."