Edinburgh University's principal says Scottish students should be allowed to pay towards their tuition, as the sector is in "danger" under the current system.
Prof Sir Peter Mathieson said that Scotland - where undergraduate tuition is free for most students - could adopt a "graduate repayment scheme" based upon salary.
Mathieson said Scotland's existing funding model was "not sustainable", but insisted he was "not advocating the introduction of tuition fees".
The University of Edinburgh is in the middle of a £140m programme of cuts, which has led to a series of staff walkouts since June last year.
