This article looks at the effects of power (conceived as complex and multi-directional) on the collaborative, interprofessional relationships of peer coaches when delivering implementation support. The study conducted ethnographic observations, semi-structured interviews and documentary analysis to evaluate the dynamics of peer coaching during the implementation of an evidence-based programme, Patient and Family Centred Care (PFCC), to improve 24 end-of-life care services. The article draws on perspectives from critical management studies to offer insights on the effect of organisational power on collaborations during the administration of peer coaching. This article details the difficulties that organisational power structures posed to interprofessional peer-coaching collaborations. Many of the peer coaches found it difficult to place their advice in the existing ethos of organisations, existing organisational hierarchies, or collaborate in the midst of staff turnover and general time management outside of their control. These considerations meant that successful peer-coaching collaborations and the success of the implementation programme were often divergent.