Christian Klien will make his F1 race comeback this weekend as he stands in for Sakon Yamamoto at HRT.
The team reported this afternoon that the Japanese driver has food poisoning, although given the chopping and changing at the team this year there is inevitably speculation that there could be some commercial reasons behind the change.
Colin Kolles said: “It looks as if Sakon Yamamoto has a food poisoning, and he doesn’t feel well. Because of this, Christian Klien will be driving the car this Friday and the rest of the Singapore Grand Prix. I hope Sakon gets well soon and is able to drive at his home Grand Prix in Japan.”
Evidently Dr Kolles has already determined that Sakon won’t be well enough to take over driving chores on Saturday.
Klien drove on Friday morning in both Barcelona and Valencia. so he does at least know the car. Since his last race with Red Bull in 2006 he has had spells as test driver with both Honda and BMW Sauber.
Adam Cooper F1 
Having doubted his food poisoning as well, I understand he is probably okay and the other reasons caused the seat changing : economic?, commercial? or performance?
By the way, Dr.Colin should know Sakon comes from a doctor family who runs quite a few hospitals in Aichi pref., Japan (form which part of turnover could be his seat fee) …
Having had food poisoning in the past, I would not like to be bouncing around Singapore in an F1 car for 2 hours. Not certain of what would happen 🙂
Adam.. remember when I had food poisoning in my Tokyo apartment when you were there… Probably 1995 ?