Richard Burns' World Rally Championship challenge ended on Monday after he was taken to hospital and ruled out of this week's final event in Britain.
The Englishman's Peugeot team said he fainted on Sunday evening.
Burns has been involved in a close battle for the title and is five points behind co-leaders Sebastien Loeb and Carlos Sainz and four behind Petter Solberg.
"Doctors will give an update today on their diagnosis and the seriousness of his state of health," a Peugeot statement said on Monday.
"They have already declared that Richard Burns will not be authorised to recce and to enter [Rally GB]."
Burns, 32, has not won a rally since he joined Peugeot at the beginning of 2002.
And the Subaru-bound driver's absence in Wales brings his career with the team to a premature end, as well as his hopes of a second world title.
Burns' co-driver Robert Reid said: "The doctors have basically told Richard not to do the rally. He's having more tests done today, but he's in good form considering the circumstances.
"Obviously he's hugely disappointed about the whole thing. I thought this year would have a sting in the tail, but I wasn't quite prepared for this."
Peugeot asked world governing body the FIA for authorisation to replace Burns and Reid with Freddy Loix and Sven Smeets.
The rally begins on Wednesday and concludes on Sunday.
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MMIX
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I thought this year would have a sting in the tail, but I wasn't prepared for this
