Bruno Senna has denied reports that he has signed or is close to signing deal to race for Williams this year.
Speculation surrounding the Brazilian has intensified this week, with some sources suggesting that Embratel, a Rio de Janeiro-based company that backs 28-year-old, could take over as title sponsor and replace AT&T, which ended its deal with the Grove-based outfit on December 31.
Senna, who made his F1 debut in 2010 with Hispania and who impressed at the end of last season, when he was drafted in for the last eight races by Lotus Renault GP to replace Nick Heidfeld, has confirmed though that nothing is in place as yet.
"Despite some rumours, my situation remains the same as before," Senna wrote on his Facebook page.
"i.e. I'm still not confirmed with any team and still battling for a place in F1. Thanks for the support. Let's keep fighting!"
Senna had hoped to stay with Lotus Renault GP for 2012. However, the Enstone-based operation instead opted for Kimi Raikkonen and Romain Grosjean.
Senna is thought to be one of a number of drivers' in contention for the second Williams seat, along with fellow Brazilian and veteran Rubens Barrichello, ex-Force India man Adrian Sutil, former Toro Rosso pilot Jaime Alguersuari and Vitantonio Liuzzi.