Vettel was negotiating a move to Mercedes

Sebastian Vettel admitted that while driving for Ferrari, he was negotiating with Niki Lauda about moving to Mercedes, where he would become Lewis Hamilton's team-mate.  

Sebastian Vettel: "There was a chance, I talked about it with Niki, but it was still in the middle of my stay at Ferrari. But it wasn't particularly interesting for them either – Lewis was number one in Mercedes, and I'm not sure they would like to see both of us in the team. And I didn't particularly want to leave myself, because I was devoted to Ferrari. 

It's not easy to be Lewis' teammate, I would have liked to fight him at the wheel of the same car, but at that time I was striving to win the title with Ferrari, I didn't want to change the team, so in the end it didn't happen. 

Lewis and I have been getting along well lately. The turning point was the race in Baku in 2017, where what can now be called a "misunderstanding" happened between us. 

It seemed to me that Lewis decided to give me a "break test". It was one of those moments when something didn't go the way I wanted. I was upset and couldn't keep my emotions under control.

This incident could have further alienated us from each other, but it turned out the opposite – it brought us closer. Soon I admitted that I behaved unsportsmanlike, we talked and since then have become closer to each other".