Scuderia Toro Rosso team principal Franz Tost feels Max Verstappen and Carlos Sainz have the talent to succeed at the highest level of Formula 1 so long as they flourish in the correct environment.

Ahead of the 2015 season, the Italian team made history by announcing the youngest driver line-up in the sport's history with the signing of 20 year-old Sainz and 17 year-old Verstappen, the latter going on to become the youngest person to start and score in F1.

Indeed, though the signings sparked controversy initially and even prompted the FIA to introduce an overhaul to the Superlicence system so as to prevent a repeat of Verstappen's rapid rise from karting to F1, both he and Sainz have proven more than competitive in their rookie seasons.

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On the back of Verstappen's run to fourth place at the Hungarian Grand Prix, Tost says he is pleased with their rate of development.

"I have to say I am more than satisfied," he told "Both have proven that they deserve to be in F1. Mistakes and spins are part of the education process, so that is all forgiven. If you want to go to the limit you can only find it when you spin or crash."

Indeed, Tost predicts bright futures for both drivers should they be allowed to flourish in the right environment.

"The learning process is quite important and if these two drivers continue with the gradient of their learning curve then both of them - if the environment is correct - can win races. Both are highly skilled and committed. The rest I will keep to myself."

After the first half of the 2015 F1 season, Verstappen's record-breaking fourth place finish in Hungary currently places him 11th in the overall standings, while Sainz is 16th having suffered the lion's share of Toro Rosso's mechanical issues.

Indeed, Tost feels Toro Rosso has been unable to show its true pace this season due to persistent issues with the Renault drivetrain. However, he says the team itself must shoulder some of the blame too.

"Many times we've had problems with the drive train - but not only that. The team has also made mistakes. The race in Silverstone saw a mechanical failure on the car - and that one went on us! So we have to improve our processes on the operation side. We have to work with more discipline - and if we get that right we will eventually score more points.

"We should not forget that we've had ten races so far and that should ideally mean that we've seen the chequered flag 20 times. But we've only seen it eleven times. That is not a good enough percentage. You cannot expect to talk from a successful operation if you do not finish a race nine times. We are seventh in the constructors championship because we simply lost too many points."