Fernando Alonso says that he will not be satisfied if he retires from Formula 1 having won two world championships.
The Spaniard claimed back-to-back titles in 2005 and 2006 but has yet to add to his collection, having lost out in three title showdowns in 2007, 2010 and 2012.
Alonso says that he remains 'hungry for success' despite Ferrari's difficult start to the 2014 season, which has prevented Alonso from standing on the podium so far.
"I never thought I'd become Formula 1 driver, I never thought to win one Grand Prix so I was not sure I could win two championships," Alonso told CNN, in an interview to be shown later this week.
"I'm extremely proud and extremely happy with my career. If you ask me right now and I am in a middle of a competition, I am hungry for victories, hungry for success and I will tell you that two championships are not enough."
Alonso also played down suggestions that he has a difficult relationship with new team-mate Kimi Raikkonen and insists that they complement each other well.
"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," he said.
"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 inside the team.
"There are zero problems, there are only good things or positive things. There's a huge communication and a huge teamwork despite what you read or what you see from the outside."