Former Pakistan cricket great Imran Khan Friday criticised a South African demand to change venues for two matches during a forthcoming tour of Pakistan because of security concerns.

"I see (the) South African demand (as) illogical after assurances by the Pakistan government that the team would be given highest security," said Khan, an ex-captain and now a member of the federal parliament.

"The government is the best judge of the security in the country," said Khan, who played 88 Tests and 175 one-day games for Pakistan.

"Terrorism can take place anywhere in the world and most countries have unpredictable security including South Africa," he said.

The South African team is due to tour Pakistan from September 22 until October 27 during which they will play three one-dayers and as many Tests.

They play a one-day warm up game, a one-day international and a Test in Karachi and one Test in Peshawar.

United Cricket Board of South Africa (UCBSA) has demanded that the Pakistan Cricket Board (PCB) relocate the matches scheduled for the southern port city of Karachi and the northwestern border city of Peshawar over security concerns.

A UCBSA delegation -- comprising commercial director Ian Smith, security director Bob Nicholas and Ben van Deventer from the South African police services -- is due in Pakistan on Sunday to ascertain security and will report back to the board.

PCB has already offered South Africa the top-level security reserved for state heads during their tour.

Pakistan has suffered a cricket drought as foreign teams have refused to tour the country following two suicide bomb blasts in Karachi during Test series in May and June last year.