Cochrane Rehabilitation developed a series of actions to provide the global rehabilitation community with the best available evidence to respond to the COVID-19 pandemic. These initiatives constituted the REH-COVER (Rehabilitation COVID-19 evidence-based response) action. In March 2020, the first initiative started in agreement with the European Journal of Physical and Rehabilitation Medicine (EJPRM): the rapid systematic review of all papers relevant to COVID-19 rehabilitation to inform rehabilitation health professionals rapidly. Currently, we are facing the long-term consequences of COVID-19, initially called "long Covid" and now named post COVID-19 condition (PCC), which led to the request by the WHO Rehabilitation Programme for evidence synthesis to support the development of specific recommendations. Cochrane Rehabilitation provided the best available evidence from the REH-COVER rapid living systematic review results, a systematic scoping review on the models of care and a summary of "evidence relevant to" the rehabilitation for adults with PCC. Based on this evidence, expert groups developed the 16 recommendations for the rehabilitation of adults with PCC recently published in Chapter 24 of the WHO "Clinical management of COVID-19 living guideline." This paper aims to introduce the Special Section of EJPRM reporting the work performed by Cochrane Rehabilitation to produce a summary of the existing "evidence relevant to" the rehabilitation of adults with PCC. The paper reports the methodology (overview of systematic reviews with mapping) and introduces the concept of "evidence relevant to" rehabilitation.