Ferrari driver Sebastian Vettel says the suspected gearbox issues he experienced in second practice for the Austrian Grand Prix on Friday "seem" unrelated to those he suffered in the morning.

Despite limited running, Vettel still managed to top the times in second practice, posting a 1 minute 09.600s lap, which left him 0.011s up on Mercedes driver Nico Rosberg and 0.260s up on team-mate, Kimi Raikkonen.

Quizzed on his problems in the afternoon, the German said: "We had an issue with the gearbox, some of the sensors switched into alert mode and we slowed down. We will have a close look, we don't know yet what's the problem but it seems unrelated from this morning."

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Vettel did concede though that the stoppages were frustrating and in total he did just 32 laps over both FP1 and FP2.

"It's a circuit where it's important to have a rhythm, it's a short lap so you need to get into the rhythm and it helps the more laps you do. Unfortunately we couldn't do as much as we wanted but that's what it is and now we have to go from there and see what happens tomorrow and especially on Sunday," he explained.

So where is Ferrari in relation to Mercedes? "It is difficult to say. Usually they are always able to make a step overnight. Hopefully we can stick with them and put a lot of pressure on them tomorrow," concluded the four-time F1 world champion.