With Vitantonio Liuzzi promoted to the other race seat at Monza, it looks increasingly likely that Force India will field an unchanged lineup next year.

German Sutil, 26, had a strong weekend at Monza just over a week ago and also has some of his personal sponsors backing the team.

"We are very, very content," Roberts told Auto Bild Motorsport when asked about Sutil.

"We have known for a long time that he is a fantastic driver and now we are finally giving him a good car.

"He trains so hard and works very well with the engineers.  He pushes himself and is always motivated and in the past years matured very well.

"It would be good for him and for the team if he stays," Roberts, who joined Force India from McLaren, added.