Sergio Perez turned down Renault for 2017 because he is probably holding out for Ferrari, according to Nico Hulkenberg.
Hulkenberg, the Mexican's current Force India teammate, has in fact accepted Renault's offer of a works seat for next year and beyond.
"I think it's the right step for this stage of my career," the German told Auto Motor und Sport.
"Since I've been in F1, I always wanted to drive for a manufacturer and this is now a good opportunity."
Before the 29-year-old was signed, however, Renault negotiated with Perez but the Mexican and his backers ultimately decided to stay put at Force India for another year.
"In his view, it might make more sense," Hulkenberg said.
"He might be hoping to be at Ferrari one day, but for me, the doors are closed to the current top teams at the moment."
Hulkenberg insists that he is not jumping ship because of instability or financial problems at Force India, even though title sponsor Subrata Roy is in jail and Vijay Mallya is currently unable to travel.
"I don't fear for their future," the German said.
"Since I've been here, there were always headlines and rumours like that - but the team and Vijay are still there."
Renault have acquired eight points so far in this year's constructors' championship.
