Mercedes CEO: We have the "perfect" driver line-up

London, England - Daimler CEO Dieter Zetsche says he is perfectly happy with Mercedes' F1 driver duo.

Team boss Toto Wolff warned recently that if the bitterness of the rivalry between Lewis Hamilton and Nico Rosberg spills into the team spirit, he would consider making a change.

But Zetsche told Auto Express that the Briton and German are in fact "the perfect couple".

Hamilton's lifestyle not an issue

Even Hamilton's extravagant off-track lifestyle, he said, is not a problem.

Zetsche said: "As long as Lewis wins races he can organise the rest of his life - as long as it is within the scope of our brand values - as he wants to.

Read: Hamilton: Mercedes will dominate in 2016

He added"At the same time we have the other guy who's as fast and has a very different lifestyle with a family and a kid.  These are the two bookends and I think we are really very lucky to have them, they are the perfect couple."

Ferrari can close the gap

Zetsche also addressed the issue of Mercedes' utter dominance over the past two years, suggesting he hopes Ferrari manages to close the gap for 2016.

"We want to win," he said, "preferably in the last race by two points. But this is not our task to reduce the gap, but the task of our competitors."

Rosberg posted a montage of his 2015 highlights:

Dear Fans, we shared some really great moments in 2015. Let's have many more highlights in 2016 all together. Me and my family are wishing you a great Christmas time and all the best for 2016. Liebe Fans, wir hatten super Momente in 2015 zusammen. Lasst uns noch mehr highlights in 2016 feiern. Meine Familie und ich wünschen euch eine tolle Weihnachtszeit und alles Gute für 2016! Queridos aficionados, tuvimos momentos estupendos juntos en 2015. En 2016 seguiremos celebrando más momentos estupendos! Mi familia y lo les deseamos a todos una feliz navidad y todo lo mejor para el 2016. Cari Sostenitori, abbiamo condiviso dei momenti bellissimi durante il 2015. Vi garantisco che ne avremo altrettanti, se non di più nel 2016! Io e la mia famiglia vi auguriamo un meraviglioso natale e tutto il meglio per il 2016. Chers Fans ! Nous avons vécu de super moments ensemble en 2015. En espérant fêter encore plus de highlights en 2016 ma famille et moi vous souhaitons une belle fête de Noël et une bonne année 2016. #merry #christmas #froheweihnachten #feliznavidad #mercedes #f1 #mercedesamgf1

A photo posted by Nico Rosberg (@nicorosbergofficial) on Dec 23, 2015 at 9:54am PST