Ferrari have went for youth in Leclerc rather than the veteran experience in Raikkonen - with the former having a very successful rookie campaign with Sauber.
Vettel and Raikkonen publicly got on very well with each other, and Vettel suggested that was why there was no unnecessary politics between the pair.
"I do not know yet (about politics)," Vettel told Blick. "The harmony between me and Kimi meant that there were not unnecessary politics. We have always left each other with the necessary space and thus not give the team unnecessary worries."
Vettel has indicated that only time will tell whether his relationship with Leclerc is a strong one or not.
"Everyone is different, and how Charles and I will tick together will become apparent," Vettel added. "But he is a well-bred boy and Ferrari is a huge chance for him. The basic law will not change this time either: everyone wants to beat each other."