London - Sebastian Vettel has a big season ahead of him at Ferrari and could feel the heat from new team-mate Charles Leclerc, retired Formula One world champions Jenson Button and Nico Rosberg said on Monday.
The 31-year-old Vettel, a four times world champion, lost out to Mercedes' Lewis Hamilton last year after the German and his team made some costly mistakes after a strong start to the campaign.
Ferrari has brought in Leclerc, 21, as a replacement for 2007 champion Kimi Raikkonen and replaced team principal Maurizio Arrivabene with long-time insider and technical head Mattia Binotto.
"The pressure is on, absolutely," Vettel's compatriot Rosberg told Sky Sports television.
"He (Vettel) was feeling it, I'm sure, already last year, and especially driving for Ferrari - that's where the pressure is the highest because you've got the whole country on you," added the 2016 champion.