But the team finds itself in such a predicament less than 100 days before the first Grand Prix weekend of the 2017 season.
"Toto (Wolff) was very understanding, with Niki (Lauda) it took a little more time," Rosberg told French broadcaster Canal Plus.
Speaking of the two leading candidates to replace him, Rosberg said: "I don't know. But I do know that Valtteri Bottas and Pascal Wehrlein are both excellent drivers."
Rosberg reportedly gave up a two-year Mercedes contract worth around €45 million.
"It was a good contract," the German admitted, "but I didn't even think about money in my decision. Through my work, I was able to make a lot of money, and I understood that more would not have made me happier in the future."
Regarding his own future, Rosberg added: "Jacques (Villeneuve) told me once to continue as long as possible, but I didn't listen and I'm relaxed about my decision."
Bahrain International Circuit - Winter testing