Takuma Sato's test run for Toro Rosso was brought to a premature end on Thursday when rain hit the Jerez circuit in Spain.
Takuma Sato has said he is hopeful of a future in Formula One after the demise of Super Aguri.
The future of financially-troubled Super Aguri remains in the balance ahead of this weekend's Spanish Grand Prix.
Super Aguri's future is secure after they announced they are to receive financial backing from the Magma Group.
Super Aguri's 2008 challenger, the SA08, has passed the FIA's mandatory crash tests.
Super Aguri say they have yet to confirm driversTakuma Sato and Anthony Davidson for next season.
Takuma Sato has hailed Super Aguri's seventh place in the Constructors' Championship as a "gift," but one the team has worked hard for.
Anthony Davidson and Takuma Sato appear set to retain their positions at Super Aguri next year.
Images from Sunday's Japanese Grand Prix, won by Fernando Alonso.
Honda's Alex Wurz describes the venue for Sunday's Japanese Grand Prix.
McLaren drivers head off to Japan determined to retain title leads.