This paper examines the omission of the relativizer ki in Subject Relative Clauses in Mauritian Creole. Recent studies, focusing on Non Subject Relative Clauses, have proposed that relativiser omission could be explained by factors such as ambiguity avoidance, predictability (via logistic regression models) and lexical choice. Our contribution is to test the validity of two of these hypotheses namely ambiguity avoidance and determiner selection, in Subject Relativisation.