Carlos Sainz says he feels he has 'done a good job' in his first season of Formula 1 after having his future with Toro Rosso all-but-assured with the confirmation the team will run Ferrari engines next year.

The Spaniard - who won the 2014 Formula Renault 3.5 title - formed a headline-grabbing all-rookie line-up at Toro Rosso this season, alongside Max Verstappen, and proved competitive from the off with four points' finishes from the opening six rounds.

Though intermittent reliability woes and 'inconsistencies' associated with his inexperience served to count against him as the season progressed, particularly relative to Verstappen, Sainz nonetheless feels he has shown enough flashes of pace in 2015 to negate the negatives..

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"I end this year with a positive feeling," he said. "I think we've done a good first year and, even though we've had some inconsistencies, overall I think we managed to create a good impression and learn a lot.

"Therefore I'm a very happy man. As a rookie, your first year in F1 is never easy because you need to prove yourself, but I'd say I've done a good job in 2015 and this makes me smile."

Going forward, Sainz will almost certainly remain with Toro Rosso in 2016 after the team was finally given the go ahead to use a Ferrari engine supply for next year last week. Though it will be using a year-old power unit, Sainz is confident Toro Rosso will still take a notable step forward in 2016.

"I'm now looking forward to next year," he continued. "I think the winter break will be very good for me and the team. I always come back stronger after the winter, and I can't wait to see what next year brings. I'm convinced it will be a step in the right direction and that we'll have an even more competitive car and I'll keep growing as a driver in Formula 1."