Fernando Alonso says he is not satisfied with two world championships and remains "hungry for victories" after Ferrari's poor start to the season.

With Ferrari having failed to score a podium in the opening three races and currently sitting fifth in the constructors' championship, team principal Stefano Domenicali stepped down from the role on Monday. Speaking before that announcement was made, Alonso said he is proud of his time in F1 so far but doesn't feel he has enough titles to reflect the career he has had.

"I never thought to become Formula 1 driver, I never thought to win one grand prix so I was thinking not sure to win two championships ... I'm extremely proud and extremely happy with my career," Alonso told CNN's 'The Circuit'. "If you ask me right now and I am in a middle of a competition, I am hungry for victories; hungry for success I will tell you that two championships are not enough."

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Speaking about his relationship with team-mate Kimi Raikkonen, Alonso said his presence "is a huge help" and played down any tension between the two.

"I think he's very talented so that is a huge help and a huge motivation for myself first and also for the team because the team knows it has to deliver a good car because Kimi will deliver a good result.

"I think from the outside it's always exaggerated how the relationships between teammates are. It's true that you should beat your teammate to have a better reputation or to have a better result in that weekend. But believe me when we are in a meeting or a debrief after a race, people should see the atmosphere ... that is inside the team.

"There are zero problems, there are only good things or positive things; helpful comments from the other driver. There's a huge communication and a huge teamwork despite what you read or what you see from the outside."