Ferrari F1 team principal Maurizio Arrivabene has praised Sebastian Vettel's contribution to the Scuderia's 2015 season, with emphasis on the German's off-track effort.

Vettel's transfer from Milton Keynes to Maranello was always seen as a 'win-win', with Ferrari gaining a four-time world champion and the German receiving a fresh canvas on which to show his ability, and the partnership has gained two wins so far this season despite the apparent might of Mercedes.

Off the track, however, Vettel is having an equally motivating impact, urging the Prancing Horse on in its pursuit of success.

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"He's a hard worker and he took to the team with a lot of enthusiasm," Arrivabene confirmed, "Many times he is helping me to make sure we are all getting together and, most important, he's co-operating very, very well with his team-mate.

"They are friends and this is the reason why, when I was explaining about the confirmation of Kimi [Raikkonen for 2016], we are looking at the moment at the stability of the team.

"Seb is a fantastic champion, but he is also a person that is helping to stabilise the team, together with Kimi. He is helping all of us to get together to look forward. Sometimes you know my face - today you saw my face after the race - but you look at Seb and he's always smiling and positive."