Valtteri Bottas says he is unconcerned about the increased expectation on him and the Williams Martini Racing team following his breakthrough F1 season in 2014.

After managing just a single points'-scoring finish in his maiden season of F1 racing in 2013 with Williams, Bottas emerged as a regular podium contender in 2014 with the vastly improved Mercedes-powered FW37, the Finn going on to finish a superb fourth overall with six rostrums.

Retained for a third season with the revitalised team, Bottas understands there is greater attention and pressure to retain that upward curve into 2015, but he feels the expectation is 'healthy' and the support simply spurs the team on.

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"I think it's healthy," he told Crash.net. "Everyone is expecting us to be strong, which is really nice and that also motivates us even more. The main thing is that we as a team, we want to win races and it comes from there. Everyone is supporting that. For me personally, there's no pressure because I know my goals. I'm just really working hard towards those."

Indeed, Bottas feels Williams ended the 2014 season having developed as a team throughout the year and fully expects to continue doing so in 2015.

"If we can be closer to Mercedes this year, that would be really good. For us as a team, we just need to keep making sure that we keep improving during the season because, like we did last year, we ended up being a much, much stronger team at the end of the year than we were at the beginning of the year."