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For subsurface damage inspection of bonded repair patches, non-destructive inspection methods are needed. Additionally, monitoring the subsurface damage progress under loading is essential to gain knowledge for the repair design process. Infrared thermography is a temperature-based non-destructive inspection method. The method of optical lock-in thermography is commonly used for the steady-state detection of subsurface inhomogeneities while passive thermography can be used to monitor changes in surface temperature due to thermal energy dissipation. Here, the progress of subsurface damages is of interest. Both methods are analysed in terms of their applicability to monitor subsurface damage propagation under loading. This paper shows how these methods contribute to understand the degradation process of a mechanically loaded patch repair.