Possessing strong communication skills is essential in contributing to effective teaching. This paper investigates graduating student teachers' English language proficiency, as measured by IELTS tests scores, of graduating EL student teachers. The paper considers what teachers need to know about the English language given that English has been the medium of instruction (MoI) for Singapore schools since 1987. Given such a context, English language proficiency is an important consideration in the preparation of pre-service teachers in Singapore. Implications for additional training and preparation in language skills are also proposed.