Would your current employer be willing to provide a reference for you?

Before your interview, make sure you have your references prepared just in case the interviewer requests them. If you don't feel comfortable using your current employer as a reference, explain that you have other references better suited at this time. Those can be past supervisors, co-workers, a volunteer coordinator, or even a professor.

"My previous manager has since left the company, and I would be happy to provide his information, as well as some other helpful references. I prefer to postpone contacting my current boss, seeing as they do not know I am looking for a new position."