The purpose of this paper is to develop and investigate the relationship between intangible resources such as employee relationships and workplace collaboration in building sustainability potential. A research model and hypotheses were constructed on the grounds of Resource-based-view Theory (RBV) and Cooperation theory (CT). The data was obtained from 175 employees' from the telecommunications sector in Poland. The results were used to carry out a two-step structural equation modelling analysis, including confirmatory analysis and verification of the hypothesized relationship. The findings indicate that there is a linkage between intangible resources such as employee relationships and sustainability potential. Additionally, the results imply that workplace collaboration impacts the development of sustainability potential. Furthermore, collaboration strengthens the explicit knowledge flow within organizations. This research demonstrated the importance of employee relationships as a key component of organizational sustainability. Collaboration is positively related to explicit knowledge transfer. Managers should promote positive employee relationships in order to enhance the organization's sustainability potential.