Vettel shocked by extent of Mercedes upgrades

Sebastian Vettel has admitted he is a "bit surprised" to see Mercedes bring the amount of upgrades they have to the Formula 1 pre-season test in Barcelona.

Mercedes, last week, admitted they were behind Ferrari but in their W10, they rolled out some major aerodynamic upgrades on Tuesday.

Asked if he kept a close-eye on Mercedes' upgrade, Vettel replied to Motorsport.com: "Yes. You definitely look at it. That interests me too.

The German four-time world champion admitted that the way testing is, he doesn't focus too much on the leaderboard.

"I haven't analysed the times exactly yet," he continued. "We have a few people with us who are better at that than I am. Red Bull definitely looks very strong and consistent, and reliable so far.