Purpose: This paper aims to identify the key competencies managerial coaches have and examine the significant competencies that affect coaching effectiveness in the Malaysian telecommunications industry. Design/Methodology/Approach: The unit of analysis was individual managerial coaches who were working in the Malaysian telecommunications industry. Among the 300 questionnaires distributed, a total of 140 were obtained and deemed sufficiently complete to be useable. Descriptive and multiple regression analyses were used to analyze the data. Findings: The results indicated that leadership development is the most important function of managerial coaching, followed by communication. In addition, co-creating the relationship and effective communication are the critical categories of competencies for managerial coaching. Analysis from the regression highlighted that effective communication is the influencing factor on the coaching effectiveness, followed by facilitating learning, and results. The findings also shown that all the core competencies in setting foundation are the significant influencing factors. Research Limitations/Implications: Analyses relied on cross-sectional data and limits the generalizability of findings to other industries. The utilization of self-reported perceptual data may suffer from response bias. Practical Implications: This paper highlights personal or professional coaching characteristics that might affect managerial leadership development. It also provides a list of important criteria for developing effective managerial coaching to assist Malaysian managerial coaches to build a world class workforce. Originality/Value: Using International Coach Foundation competency model, this study provides an insight on the important criteria to develop and select coaching managers effectively which ultimately lead to performance improvement in the organization.