Toro Rosso team boss Franz Tost believes young Australian Daniel Ricciardo needs one more year at Toro Rosso before he would be ready to join the main Red Bull team.

Ricciardo is in contention to replace Mark Webber at Red Bull next season as is Kimi Raikkonen and seemingly Fernando Alonso.

The Toro Rosso boss, who oversaw Sebastian Vettel's rise to fame at the team back in 2008, admits he sees no reason why Red Bull should not choose Ricciardo over the two men with a combined three drivers' championships.

"Personally I would rather see him get another year in the maturing process at Toro Rosso," said Tost.

"I mean, we are talking here about Red Bull Racing, the champion team of the last three years," Tost said.

"Daniel has never been on a Formula One podium, he has not won a race -- because our car was not good enough.

"That's the only negative I see for him. Otherwise, I think he will have great successes in Formula One."

But Tost also claims he does see similarities between the young 21-year-old Vettel and the current 23-year-old Ricciardo.

"The biggest difference between Vettel and Ricciardo was that Vettel went to Red Bull when it was not a winning team. They grew up together.

"But Ricciardo must immediately be on the podium and fighting for wins.

"Perhaps the chance has come a year too early," added Tost.

Should Ricciardo get the call to Red Bull speculation has either Antonio Felix da Costa or Carlos Sainz Jr. as possible replacements at Toro Rosso, however Tost believes Spaniard Sainz Jr. is not yet ready for F1.

"I told him (Sainz) that he needs to win races in GP3," Tost is quoted by Speed Week.

"He is 18 years old now. I assume that he could be at Formula One maturity in about two or three years.

"He has not yet attained the results in GP3 that are expected of him," he added.

Webber will leave Red Bull and Formula One at the end of this season to join Porsche Racing, leaving his Red Bull seat vacant.


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