Brazilian Antonio Pizzonia will again drive for Williams at this month's Belgian Grand Prix as Ralf Schumacher is still injured.
Pizzonia will continue in Ralf's absence
German Schumacher has out with a back problem since the US Grand Prix in June when he crashed heavily into a wall.
Pizzonia replaced Schumacher in the last two races, scoring seventh-place finishes in Germany and Hungary.
He will continue alongside Colombian Juan Pablo Montoya at Belgium's Spa-Franchorchamps circuit on 29 August.