Leclerc replaced Kimi Raikkonen in Ferrari for the 2019 campaign after just one year with Sauber, while Vettel is preparing to come back from mixed 2018 in which he fought for the title but made several high profile mistakes.
Button joins Sky Sports F1 as a full-time expert for this season and, speaking on a day of promotional filming, the 2009 world champion compares Vettel's situation with Daniel Ricardo arriving at Red Bull in 2014
"Ferrari's Sebastien is a very different atmosphere than in Red Bull," Button told Sky Sports News.
"Maybe there is more pressure, and we'll see how he can handle this year when Daniel entered Red Bull, and it was difficult for him."
Daniel puts him under great pressure and actually outperforms
] "I think if Charles can make this year, it's a tough decision from where Sebastian will go for the future and who
Button said that Vettel, a four-time world champion, is" an incredibly skilled driver and super-fast. "
However, the former McLaren and Honda driver said: "Charles looks such a happy man, really relaxed and I think the team on Tina will take it. And this can sometimes harm the other driver. "
Vettel led the 2018 Championship before the middle of the distance but was priced with the price as it collapsed from the front of the Grand Prix of Germany and revolves in three other races
Baton of Nico Rosberg , the world champion in 2016, agreed that Vettel is under pressure against Leklerk.
Speaking of the same event, Rosberg told Sky Sports News: "He needs to improve and the team has to
are some big changes as we know they got rid of [team principal Maurizio] Arrivabene and put [Mattia] Binotto
"They made a change in the most kata position there. Leclerc can also be a very, very positive dynamic – but it can also be negative, it can also be turned.
"It'll be great to watch."
Button's Sky movement will make it easier to return to the F1 paddy after spending 2018, its second year of full-time racing, focusing on its winning Super GT title in Japan.
He said Verstappen also faced an important year for his future as Red Bull connects
"For Max is complicated because he always moves forward, he's always looking for something else," Button says. "He jumps to Red Bull and wins his first race." This year is a very important year to keep moving. He has to fight for the championship or I think he will start asking questions when he has to be in the future. "