Adrian Sutil has expressed his concerns for those he described as "children" joining the F1 grid in 2014.

Next year 18-year-old Sergey Sirotkin and 19-year-old Daniil Kvyat are set for drives with Sauber and Toro Rosso respectively and Sutil believes the two young men are not ready for life in motorsport's big league.

"I think it's much too soon (for them)," the Force India driver, who is 30, told Speed Week. "They are still children.

"But in Formula One it takes grown men, because it is a very tough business. It's also a shame, because it hurts these young talents if they come in too soon. There is no reason for it.

"Yes we have Russia on the calendar next year, so it's nice if we have a Russian driver. But I think it's too risky," said Sutil.

In the case of Kvyat, Sutil says he has greater worries for him because he will jump the usual feeder series of GP2 and Formula Renault 3.5  straight to F1 after racing in GP3.

"It's not easy to control a Formula One car," said Sutil, "especially with these tyres. These are ultimately the fastest cars in the world, so it's a risk for everyone.

"Maybe I'm wrong and they are faster than me. But I think talent like that is rare -- maybe one in a thousand drivers who make it into Formula One," the German added.

Another driver who entered F1 at a young age was Jenson Button who was 20 when he made his debut in 2000, now at McLaren the 33-year-old has also been critical of the decision to promote Kvyat earning him this response from Red Bull's Dr Helmut Marko.

"Jenson Button should focus on his career," Marko told the Russian website "I think we have proved we know what we are doing.

"I don't care what anybody says," Marko continued. "Look at what we've done with Vettel. Half the paddock said he was 'too young, he is not ready, he will never be successful'.

"What do I have to say? I don't go to McLaren and tell them what to do," Marko insisted.

The outspoken Austrian also hit back at claims Toro Rosso had shown interest in non-Red Bull academy drivers such as the McLaren backed Stoffel Vandoorne and Dutchman Robin Frijns.

"I never talked to him!" Marko insisted loudly, referring to Vandoorne. "Ask him. Please do. Another guy, this crazy Dutch guy (Frijns), he said he turned down our offer.

"We never offered him anything and it annoys me to have to listen to what they say."

Vandoorne's manager Richard Goddard had a different view on Marko's comments.

"It is true that there was no offer," he told Auto Motor und Sport, "but there was interest from Toro Rosso's side."

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