Heikki Kovalainen has passed a fitness test which will allow him to race in this weekend's Turkish Grand Prix.

The McLaren driver was knocked unconscious in a 150mph crash at the Spanish Grand Prix and governing body the FIA ordered him to undergo tests.

Kovalainen emerged unhurt after ploughing into the tyre barrier at the Circuit de Cataluny, but was knocked out by the impact and has no memory of the accident.

The 26-year-old was released from hospital on Monday after several CT scans and described his injuries as a "slight headache and stiff neck".

But he has now put the crash behind him and is turning his attention to racing in Istanbul.

"Formula One is a risky business," said Kovalainen. "You know that as a driver, but you don't think about it.

"If you worry about things like that, you lose focus. I guess it's just not in my psyche.

"I can't wait to get back into the car and race with the team next weekend."

After leaving Spain four days after his crash, Kovalainen travelled to his native Finland to resume training with team-mate Lewis Hamilton.

The Finn will use the team's spare car from Barcelona in Turkey this weekend.

The McLaren team said a wheel rim failure caused his front left tyre to deflate in the middle of the tough Campsa right-hander in Barcelona.

"It's possible that some debris worked its way inside the rim, but we still have to analyse that," said McLaren F1 chief executive Martin Whitmarsh.

"It was a new wheel and we don't think it was a structural failure.

"There were some score marks, but we don't know whether they were caused by debris or by his trip across the gravel trap."