This work examines the use of the English language by the employees of PWC Nearshore, a firm deployed in Morocco and which manages only French companies’ files. The main purpose of this study is to explore whether this multilingual character constitutes a strength or a risk for the firm's activity and development. The methodology of this work is based on group interviews with the auditors who had spent at least a year in PWC firm. The questions asked are related to all the interactions and acts carried out using English (e.g. trainings, missions, handling software, etc.). We concluded that the existence of a business platform developed in English and the mandatory e-learning in English are the main elements promoting the use of English in a French firm whose clients are all French. However, managers must set up language training for auditors who all come from academic curriculum entirely acquired in French.