Toyota's third driver Kamui Kobayashi will stand in for an unwell Timo Glock during Friday's free practice for the Japanese Grand Prix at Suzuka.
It will be the first time that the reigning GP2 Asia Series champion will have driven in an official session, though the 23-year-old has tested extensively for Toyota in the past.
Glock is suffering from a very cold and fever and has been advised to rest by the team doctor, thus giving himself a better chance of qualifying for Sunday's race.
"It is a pity Timo is not feeling well today," said the Japanese driver. "But I am grateful for the team's trust in me to take part in practice for the Japanese Grand Prix.
"I have experienced the TF109 already and I am looking forward to trying it out at Suzuka, even though it is only for practice. I will do my best to contribute to the team's preparations and of course I wish Timo a very fast recovery."