That is the view of Spurs legend Clive Allen, who believes Daniel Levy will already be on the hunt for Jose Mourinho's permanent successor this summer.
Mason, who is the youngest manager in Premier League history, has been handed the reins until the end of the season and got off to the perfect start on Wednesday as Heung-min Son struck a late penalty to earn the Lilywhites a 2-1 victory over Southampton.
And Tottenham great Allen, who scored 60 goals in 105 appearances at White Hart Lane in four years at the club in the 1980s, believes it is too early for Mason to be considered the permanent job.
"I think it's unlikely I've got to be honest," he told the talkSPORT Breakfast.
"It smacks of Juande Ramos of when he won the League Cup and then had a dreadful start to the following season and left eight games in.
"Ryan's a Tottenham kid. He came in as a very young player and loves the club. He's said all the right things.
"He's the right fit at the moment to hold the fort until the summer and he could do his credentials a lot of good.
"What an opportunity for him it is to show his experience and the experience he'll gain over the next seven days.
"But, long term it's unlikely that he'll be the permanent manager."
Jamie O'Hara, meanwhile, backed Leeds boss Marcelo Bielsa for the Tottenham job - though he admitted it would take a lot to tempt him away from Elland Road.
"I would say Bielsa," said the talkSPORT pundit. "I think he'd be absolutely brilliant and the fans would love him.
"If you can try and prise him away form there it'd be unbelievable.
"The Leeds fans would be devastated and there would be uproar but Spurs are bigger than Leeds."