Erik ten Hag has a release clause of just £1.7million in his Ajax contract.
Manchester United interviewed Ten Hag about potentially becoming their next permanent manager last week and the Manchester Evening News reported last month the Dutchman is United's preferred candidate.
Ten Hag, 52, is out of contract at Ajax next year and was not expected to command a significant compensation fee and it has emerged he could cost United just £1.7m.