Emphasising Malay idioms as one of the aspects of the language system is crucial to produce students who can highlight the cultural heritage and thoughts. However, conventional teaching methods are still implemented by teachers, and their moderate level of differentiated instruction knowledge causes the interest of students to decrease. This study aims to identify the needs in developing a teaching module to teach Malay idioms based on an inquisitive semantic framework and differentiated instructions model through a needs analysis. The qualitative study, using semi-structured interviews, was conducted among six Bahasa Melayu teachers to collect data in three Trust Schools. The findings reveal that teachers have implemented activities that encourage the interpretation of idioms' meanings by relating to the knowledge and experience of students and integrating various interesting activities. Additionally, teachers have ensured that teaching components, such as content, processes, and products, are based on the readiness, interest, and learning profile of students. Nonetheless, various constraints caused by teachers and the environment have hindered the teaching of deep interpretation of Malay idioms and suitability with the diversity of students. The findings also clarify the need to develop a teaching module to deliver effective teaching in Malay idioms.