Technocrats and some existing ministers will be appointed to Afghan President Hamid Karzai's new government, a spokesman said on Wednesday, but his main rival branded his re-election illegal and ruled out taking any part.

Karzai, returned to power after a needless presidential run-off vote was abandoned on Monday, is under pressure from his Western backers to root out the corruption that tainted his previous administration, with a top US military official saying he should prosecute wrongdoers to shore up his legitimacy.

The run-off, triggered after widespread fraud marred the first round in August, was canceled after Karzai's only rival, former Foreign Minister Abdullah Abdullah, withdrew citing serious concerns about the vote.

That decision came after weeks of political uncertainty, while US President Obama also weighs whether to send up to 40,000 more troops to fight a resurgent Taliban, who had threatened to disrupt the poll and branded Karzai's return as a farce.

Karzai has committed himself to an inclusive government, but Abdullah ruled out taking any part despite pressure for a power-sharing deal.

"I have no interest in the future cabinet of Karzai's government and I will pursue my agenda, which is change," Abdullah told a news conference at his Kabul home.

Abdullah said the government-appointed Independent Election Commission's (IEC) decision to cancel the November 7 run-off was illegal and said Karzai would not be able to deliver reform.

"A government which is derived from such an illegal decision will not be able to deliver," Abdullah said in his first public comments since the IEC's decision.

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