Vettel impressed by Toro Rosso rookies

Four times Formula 1 World Championship Sebastian Vettel is impressed by Toro Rosso rookies Max Verstappen and Carlos Sainz

"Carlos and Max have done a very good job, they stood out this season," Vettel told journalists at the Race of Champions in London.

"Max has been a surprise because he has been very aggressive, sometimes too aggressive. But in the end he has done a very good season so far."

"He is one to be up there in the future. With his age, he has a lot of time. I'm sure he will make us worried, the older generation, which I am part of now."

"I know Carlos from from my time at Red Bull Racing. [At the time] he was helping a lot on the simulator, doing a lot of work for us, so it's good to see them racing," added Vettel.