Vettel's current team-mate, Mark Webber, is quitting F1 at the end of the season and the team are on the lookout for a replacement.
There had been strong suggestions Lotus' former world champion Kimi Raikkonen would get the drive for 2014 but Vettel believes it "would make sense" for Toro Rosso rising star Ricciardo to be handed the coveted role after his previous testing for the constructors' champions.
"It would make sense for [it to be] Ricciardo as he has been at Red Bull for a long time," Vettel said. "People will argue that he might not be ready but was I ready when I joined?"
Meanwhile, Vettel insisted he was not thinking about winning the world title just yet, despite extending his lead at the top of the standings to 46 points after his dominant win in Spa on Sunday.
Vettel is now well clear of nearest rival Fernando Alonso in the battle for the title, with Lewis Hamilton further back after he finished third in Belgium.
However, he is refusing to contemplate another overall title just yet, adding: "I feel confident in general but I'm not confident about the championship in terms of 'yes we will win it.' I'm not thinking about that, I was enjoying myself out there today."