The junior-to-senior transition (JST) is decisive for athletes who want to reach the elite/professional sport level. The JST: (a) is initiated by a set of demands relevant to athletic and non-athletic development, (b) lasts between one and four years, and (c) is characterized by athletes’ high dropout rate (Bruner, Munroe-Chandler, & Spink, 2008; Franck, Stambulova, & Weibull, 2016; Stambulova, 2009). This study is a follow up of the quantitative longitudinal study of the JST in Swedish club-based athletes (Franck et al., 2016; Franck, Stambulova, & Ivarsson, in press) and aimed at further qualitative exploration of the JST process emphasizing social influences involved. Four athletes (age M = 24.2, SD = 1.5) representing tennis, swimming, football, and basketball were interviewed. They were encouraged to reflect retrospectively on their JST process using five measurement points of the longitudinal study as an aid to structure their narratives. The interviews lasted for about 90 minutes. Thematic narrative analysis (Smith, 2016) was used to identify themes related to social influences during the JST and their perceived facilitative or debilitative effects. All four JST narratives were unique, however, to structure the results the narratives were pared to represent individual vs. team sport contexts. The results revealed that the social factors facilitating the JST were shared by both sport contexts and included family support, and good relationships with coaches and peers. The debilitating social factors that worked as the JST barriers were more diverse across the sport contexts. These factors covered a lack of sponsors/financial support and the ambiguity of requirements from the sport federations in individual sports, and changes in the structure of the team and selection to a higher level team not being ready for, in team sports. All participants went through the JST, continued a few years after, and then terminated their athletic careers.