A spokesman for the Taliban, Muhammad Suhail Shaheen, has spoken with the BBC amid reports the UK will press for a deadline extension for international evacuations beyond 31 August.
"Foreign forces should withdraw on the deadline they have announced earlier. Otherwise, it is a clear violation," Mr Shaheen said.
The spokesman added the Taliban's reaction to such a move would be a decision for the group's leadership.
Thousands of Afghans are continuing to try and flee the country ahead of the end-of-the-month deadline, with many citing fear of life under Taliban rule.
It is unclear whether international flights will be allowed in and out of the country once international forces leave and cease control of the airport.
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