Aug.22 (GMM) Ralf Schumacher is still yet to find a formula one home for the 2008 season.

The German and six-time grand prix winner is hoping to keep his Toyota seat, but his chances took a knock after a disastrous first half of this year.

32-year-old Schumacher reportedly turned to his former BMW colleague Gerhard Berger for a back-up plan, but Toro Rosso has now signed Sebastien Bourdais and Sebastian Vettel for 2008.

"Certain promises were not kept," Ralf, apparently referring to the lost STR option, is quoted as saying by Bild newspaper in Germany.

His manager Hans Mahr is now working feverishly to rekindle the Toyota option, particularly after Schumacher's form has taken a step in the right direction at recent races.

Recently in Hungary, for instance, Ralf turned in his best results of the season in both qualifying and the grand prix, culminating in sixth place.

Referring to 2008, Mahr revealed: "We have some possibilities, but our priority is still Toyota.

"This topic will still take some time."

Bild also claims that a return to Williams, where Schumacher drove under BMW power until 2004, is probably not likely.

The daily newspaper said that, as well as looking to retain Nico Rosberg and Alex Wurz, the Grove based outfit is also interested in Germans Adrian Sutil (Spyker) and BMW test driver Timo Glock.