The majority of psychological research investigating leader integrity has relied on self or other report methods as the primary means of data collection. While such an approach has advanced the literature, due to the theorised deceptive and manipulative nature of leaders lacking in integrity, prominent theorists (Barling, Christie and Turner, 2008) have called for alternative measures that are less prone to socially desirable responding. As no prior research had examined the integrity of sporting leaders, the present thesis began by examining the antecedent cognitive processes of expert football managers. Building upon this exploration, an implicit association test was developed within studies two and three. Results suggest that the instrument is capable of assessing automatic attitudes towards leader integrity, is more sensitive than existing measures, offers support for concurrent and convergent validity, demonstrates good test-retest reliability, good internal consistency, and is a predictor of player reported commitment. In sum, the present research has sought to understand the phenomena of leader integrity from the perspective of social cognition. The result of these investigations is a robust, sensitive, and complimentary measure of leader integrity, which will assist researchers to better understand the processes that underpin leader integrity.