Scuderia Toro Rosso team principal Franz Tost says he is targeting the top five in the 2015 F1 constructors' standings with its rookie driver line-up of Max Verstappen and Carlos Sainz Jr.

The Italian team, which unveiled its STR10 ahead of its testing debut in Jerez this weekend, finished a distant seventh in the 2014 constructors' standings, but comes into the 2015 season with an all-new driver line-up and an overhaul behind the scenes.

Branding the STR10 as the 'best car Toro Rosso has ever built', Tost has raised his expectations for 2015 to a best-ever performance in its tenth season of F1 racing.

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"The 2015 season does not only mark a very special occasion, as Scuderia Toro Rosso reaches its tenth year in Formula 1, but it also represents a fantastic opportunity to showcase the team's progress. Over the last few seasons we've focused on reinforcing the structure of the team, investing in new personnel in many areas in order to make sure we face the upcoming season stronger than ever before.

"After finishing seventh in the Constructors' Championship last year, our main target is to finish in fifth position and I'm confident that we can achieve this in 2015.

"The technical team led by James Key has done an extraordinary job to start this year strongly, passing all crash tests for the new STR10 first time and not losing any valuable time in the process. I'm very proud of this and it gives us confidence to keep on believing in ourselves, to be certain that we are definitely on the right track and to continue working hard to keep move forward.

"I know the team is constantly under a lot of pressure but they are aware of how to deliver and it's great to see that we are all moving together, as a team, in the same direction. We've also learned a lot from the previous seasons and this will make us much stronger in 2015.

"We need to assure we make the most out of every opportunity that arises out on track and I'm confident that this year we certainly have the mentality to do just that, keep on improving and meet our targets."