“I don’t want to ask it because I don’t think it’s necessarily a fair question.
“I don’t know. It’s up to Oscar if he allows it, you know?”
Piastri is now the outsider to secure his first drivers’ title, with the 24-year-old needing victory on Sunday and for Norris to finish sixth or lower.
“It’s not something we’ve discussed,” said Piastri, who returned to form in Qatar and should have won the race but finished second to Verstappen after a poor strategy from McLaren.
“Until I know what’s expected, I really don’t have an answer.”
However, Norris said that if the roles were reversed and it was Piastri who sought help in the decider, he would be prepared to step aside and let his teammate through.
“Personally, I think I would, just because I feel like I’m always like that. That’s how I am,” he said.
Norris was 34 points behind Piastri following his retirement from the Dutch Grand Prix at the end of August, but podiums at Monza, Singapore and Austin, plus back-to-back wins in Mexico and Brazil, saw him regain control of the championship heading into the final races.
His goal is to become the eleventh British F1 driver to be crowned world champion.
Norris originally finished second at the Las Vegas Grand Prix two weeks ago, but a double disqualification for McLaren gave that day’s race winner, Verstappen, a lifeline to return to the championship.
