``I told PCB that I am refusing captaincy because I do not want to be a dummy captain,'' Khan told a news conference Thursday at the Pakistan Cricket Board headquarters in the eastern city of Lahore.

``I will give reasons later,'' Khan said before exiting the news briefing and asking reporters not to ask him any questions.

Khan was selected as Pakistan captain after regular skipper Inzamam-ul Haq was banned for four limited-overs internationals on charges of bringing the game into disrepute during a Test against England at The Oval in August.

A PCB official confirmed that Khan, the regular vice-captain, had declined to lead his side in the Oct. 15-Nov. 5 Champions Trophy.

Khan, a middle-order batsman, made his Test and limited-overs international debut in 2000 against Sri Lanka, and has since played 47 Tests and 139 one-dayers. His highest Test score is 267 runs against India in 2005.