The paper indicates the deficiencies /gaps to highlight the needs /requirements in terms of teaching competencies for the implementation of policy decision to use English as the medium of instruction. The present paper highlights the teachers' competencies for using English as a medium of instruction. The objectives of the study were to test the secondary school teachers' speaking proficiency in English as medium of instruction and explore the causes for deficient English speaking. The research study was delimited to the teachers of secondary level of three districts in Punjab i.e. Lahore, Rawalpindi and Mianwali. The population of the study consisted of 3235 teachers. Double Sampling technique was used to select the sample. 150 teachers were selected as samples who were interviewed using interview guide in order to test speaking competency of the teachers, however the perception of 200 teachers was collected through questionnaire about causes of deficient English speaking. It was found that, teachers were deficient in grammar and vocabulary, however average in fluency, pronunciation and confidence, while speaking in English.