Sebastian Vettel admits that it is going to take more than a couple of interrupted practice sessions to know whether Ferrari has a chance of upsetting Mercedes in the Monaco Grand Prix.

The German is confident that he and team-mate Kimi Raikkonen might be able to take advantage of Monaco's torturous confines to wrest an unexpected result from round six of the world championship, but conceded that, with the afternoon session being interrupted, first by an accident for backmarker Roberto Merhi and then the onset of persistent rain, there was little concrete evidence.

Vettel was fourth fastest in FP1, just four-tenths of Lewis Hamilton's ultimate pace, before improving by one place before the rain set in in the afternoon. The gap then, however, was 1.2secs with no-one able to challenge the reigning champion for the final hour of a session with precious little running.

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"We will hopefully find out [whether we are closer] on Sunday - until then, it's obviously difficult to predict," Vettel commented, "I think we should be closer again here although, obviously, it's the nature of the track and everyone's a little closer. I don't think you can take Monaco as a reference but, for sure, I think that we are closer."

The four-time champion confirmed that he had been reasonably happy with the sensations he was getting from his SF15-T, and insisted that the rain meant that everyone remained in the same boat regarding the opportunity to work on set-up, especially with the majority not getting to run Pirelli's supersoft during the afternoon session.

"It is what it is, it's the same for everyone," Vettel confirmed, "Obviously, when it rains and we know that the forecast is better for the next days, we don't tend to run, but I think the car felt okay. We didn't get a lot of running this morning - and one run this afternoon - but it seems to be okay. Obviously, we will have to wait and see on Saturday.

"It was obviously quite slippery - too slippery to really enjoy a lot, but I think it was useful just to get a couple of laps at the start. There's not much point to do any more as, obviously, we don't have unlimited tyres so, should the rain come again, we might need those.

"To be honest with you, we didn't miss out on much. We wanted to try a couple of things on the second run, and then go for the long run, but then nobody got to do that. It's a shame not to get an idea on the supersoft tyre, but I think we will see on Saturday."