Rubens Barrichello's Formula One future looks increasingly uncertain after a major Williams shareholder said the team was talking to 2007 champion Kimi Raikkonen about a possible comeback.

Austrian Christian 'Toto' Wolff told the Kronen Zeitung that the Finn, who won his title with Ferrari, was one of several names on its list of possible drivers for next season. "We are in conversation with Raikkonen," he said. "But he is only one of several options."

Former champion Williams, enduring its worst season in Formula One with five points from 17 races, has said nothing officially about any contacts with the 32-year-old 'Iceman' despite media speculation.

Asked at the recent Indian Grand Prix whether Raikkonen might return to race for Williams next year, team chairman Adam Parr refused to be drawn. "Our race drivers are Pastor Maldonado and Rubens Barrichello and if, and when, that changes we will make an appropriate announcement," he said.

Raikkonen, still hugely popular with F1 fans despite leaving the sport for rallying at the end of 2009, told the latest edition of F1 Racing magazine that anything was possible but nothing had been decided.