Diagnostics of professional challenges of teachers is an important issue for advanced professional training. Current and potential educational needs of modern teachers can only be met through a comprehensive diagnostics of their professional challenges. At the same time, the results of self-analysis and self-diagnostics do not provide comprehensive information for designing a customized training strategy and advanced training programs. The system of current and potential educational needs of teachers is based on the results of selfdiagnostics, self-analysis and reflection, peer review, professional examination, and analysis of legal, scientific and pedagogical sources and socio-cultural context. The identified educational needs of teachers determine the content and structure of a customized educational strategy, are transformed into educational objectives and determine the content of the advanced training programs providing for a continuous education of teachers.