Up to 2,250 local police jobs may be lost
Chris Sims was speaking at a police authority meeting where he said the force needed to make savings of £123m over the next four years.
He added he was waiting for spending review figures before finalising anything but said the force needed to be prepared for large cuts.
The Police Federation warned earlier this month of large job cuts in the UK.
At the meeting, the authority also approved in principle to implementing measures which force police officers to retire after 30 years.