Vettel insists he is fully focused on '08

Red Bull announced last week that the German driver will replace David Coulthard next year as Mark Webber's teammate following his impressive season with their sister team.

Vettel admits he is happy to know where his future lies so early in the season, but he makes it clear his mind is completely focused on doing his best for Toro Rosso.

"Obviously it's good to know early in the season what are you doing next year," Vettel told autosport.com during testing at Jerez.

"But all my focus is on this year. The way I approach the weekend, or a single lap, or the race, doesn't change just I know what I'm doing next year.

"I have grown up and learned enough to go step by step and for sure this step is not yet finished. And you can see that our results are getting better, so there's a very good atmosphere, everybody is extremely happy."

Vettel has scored six points so far this season as his team continue to make progress since the introduction of their new car in Monaco.

The German is optimistic he can continue to show good pace as long as Toro Rosso keep up their development rate.

"I think if we find a good balance, and if I feel comfortable, then we have a very competitive car at this stage of the season," Vettel added. "Last race we were always in the top ten, so it's very good.

"We have to keep this momentum and work hard and develop hard to stay there."

Despite his optimism, Vettel believes Toro Rosso could have a difficult time in next week's Hungarian Grand Prix.

"Hungary is difficult. I think we will be, not struggling, but we will have a more difficult time that we had in the last few races," he said.

"But already in Hockenheim we expected it to be more difficult than Silverstone, and we managed to do quite well. So we will see. Our target is to go into Q2 and from there we'll see. "