According to Blick newspaper, Hulkenberg and his manager Werner Heinz are having "sleepless nights".
Jamie Morgan, Guest writer
Pirelli boss Paul Hembery claimed that "some teams went against our recommendations".
What happened to Sergey Sirotkin and the Russian deal?
Bruno Senna now confirms he as in talks with the Sahara Force India team prior to his leaving Formula One to contest the World Endurance Championship with Aston Martin Racing.