Valtteri Bottas says he had no reason to leave Williams as he sees the team has a bright future following its recent resurgence.

Williams announced that it will retain Bottas and Felipe Massa as its driver line-up for 2015, putting an end to any speculation over Bottas' future. Following the confirmation, Bottas said he felt loyal to the team after it gave him his first race seat in F1 and believes the team is only going to get stronger in the coming years.

"I'm really, really happy to continue with the team for next year," Bottas said. "With Williams I got the opportunity to get to Formula One, so I'm really pleased. I want to thank ... every single person in the team for giving me the opportunity.

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"Why is it good to stay? I mean, why not? We are on the right way now, we have made a big step from last year and I only see the team's future as a really good one. I see we are not yet at the peak. Williams has been in the past many years at the top and I'm really confident that we can do it again, so I'm really looking forward to next year."

Team principal Sir Frank Williams said Williams has "great hopes" for Bottas after seeing his potential at a young age.

"Valtteri is a long-term investment, naturally, since we picked him up in his very early days," Williams said. "We have great, great hopes for him too. His record in qualifying is quite remarkable and we're certainly very proud of his position on the grid today."