Consolidation of companies or assets through mergers and acquisitions (M&A) is a popular growth strategy for organisations. However, despite the growing number of M&A cases, their results often do not achieve the stated goals. The unsuccessful Post Merger Integration (PMI) phase, when the physical integration of several companies into one is executed, has been mentioned as one of the causes of this problem. For solving it, the means of Enterprise Architecture (EA), as the discipline that has been focusing on effective organisational transformation for years, could be applied in the PMI context. To this end, existing EA frameworks should be adapted to PMI specifics such as time pressure and high uncertainty. This work explores the hypothesis that EA means enhanced Knowledge management (KM) and Requirements engineering (RE) could lead to better PMI results.