Nov.5 (GMM) Bruno Senna has denied his concerns about the future are contributing to a loss of form towards the end of the 2012 season.
"It was a very tough weekend," he said.
It is reported that Williams opted against taking up the automatic 2013 'option' in Senna's existing contract.
The British team appears likely to pair Pastor Maldonado with Finnish rookie Valtteri Bottas next year, leaving Senna's backers in talks with Caterham and Force India.
Asked by Brazil's TV Globo if the uncertainty over his future is affecting him on the track, Senna answered: "You don't think about it.
"I'm thinking only about what is happening at the race weekend, from a technical point of view."