The Afghan president has called for next year's crucial election to be a US-style head-to-head contest between two candidates.
Hamid Karzai also named on Saturday three possible runners in the wide-open race.
The April 5 election to succeed Karzai, who has ruled since Taliban hardliners were toppled in 2001, is seen as the crucial test whether 12 years of international military and aid intervention has been worthwhile.
"My desire is that we should have a limited number of candidates as this is good for the country," Karzai told the media in his palace gardens.
"In the United States there were only two candidates.
"If we have two presidential candidates, it would be better, but if we had four that is also not a problem."
After serving two terms, Karzai must stand down next year for an election that will be the first ever democratic transfer of power in Afghanistan.
There is widespread uncertainty over who and how many people will run.
More than 40 candidates stood in the chaotic 2009 election, which was marred by massive fraud and delays until Karzai emerged triumphant.
Karzai named Abdul Rasul Sayyaf, a controversial former regional commander; Abdullah Abdullah, the 2009 election runner-up; and Ashraf Ghani, a former finance minister, as possible candidates.
"There are others as well, I don't want to leave any names unmentioned but it is not possible for me to mention them all," Karzai said.
Other potential contestants include Qayum Karzai, the president's brother, Omar Daudzai, the current ambassador to Pakistan, and former interior minister Ali Ahmad Jalali.