The external bonding (EB) method is commonly used to enhance the strength and ductility of reinforced concrete (RC) columns in buildings and bridges. While EB strengthening effectively increases axial rigidity and performs well under pure compression, its efficiency diminishes under bending-dominant loading conditions. This reduction is due to second-order effects arising from column slenderness and eccentricity. To address these limitations, this study introduces an innovative hybrid FRP (HYB) strengthening technique that combines the advantages of EB and near-surface mounting (NSM) techniques. In the HYB system, carbon fibre-reinforced polymer (CFRP) laminates act as reinforcement, enhancing flexural rigidity and providing confinement through EB, preventing the CFRP's premature micro-buckling. A total of sixteen RC column specimens were tested under different loading conditions, including axial compression (e/h = 0), low eccentric compression (e/h = 0.42), high eccentric compression (e/h = 0.85), and pure flexural loading (e/h =  \(\infty\) ). The study included control specimens and those strengthened with EB, NSM, and the hybrid technique, with a slenderness ratio of 32.1. Results demonstrated that the effectiveness of EB confinement under axial compression decreases with an increase in slenderness. In contrast, the HYB strengthening method proved effective for slender columns, significantly improving performance in compression- and tension-dominant zones of the P-M interaction curve.