Paul Lambert has insisted Norwich could not be declared safe until it was mathematically impossible for them to go down but dismissed fears they may be running out of steam at just the wrong time.
Canaries chief executive David McNally this week claimed his side only needed four more points to be certain of Barclays Premier League survival.
But manager Lambert refused to be drawn on whether breaking the magic 40-point barrier would be enough to ensure a second successive season in the top flight.
"I don't know if that's going to be the margin this year," Lambert said.
"Last year, you could see why, because the bottom ones were close to the mid-table teams.
"This year, there's a bit of daylight and everybody's got to play everybody."