"Potential supervisors" refers to individuals who could potentially oversee or guide a person's work or activities in a particular organization, project, or academic setting. Full definition
Applicants may call and interview potential supervisors from the list until suitable supervision is obtained. (marriage.nv.gov)
He suggests you take your time picking a PhD supervisor and to approach several potential supervisors before committing to a project. (newscientist.com)
While you're visiting potential supervisors, try to meet some of their current students as well as other colleagues in their group. (newscientist.com)