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