The leading candidate to replace Raikkonen at Lotus is the German Nico Hulkenberg.
Massa, admitted he needs to put his focus on the road in front of him.
According Force India's sporting director Otmar Szafnauer, Pirelli's mid-season tyre specification switch badly hurt some teams like Force India.
According to Blick newspaper, Hulkenberg and his manager Werner Heinz are having "sleepless nights".
Nico Hulkenberg may end up with Force India in 2014.
Eric Boullier says they gave Kimi Raikkonen the right tools to get his self-confidence back. And confirmed rumors that he is a highest paid driver in 2013.