[Truncated abstract] Collective efficacy (CE) has been consistently shown to contribute to team performance by improving motivation, perseverance, group goals, and expectancy in teams (Bandura, 2000; Feltz & Lirgg, 2001). Having high confidence in one's team is proposed to increase the expectancy for success, thereby increasing motivation, persistence and effort, which in turn, increases overall performance (Bandura, 1997). A series of studies were conducted to examine predictors of self and collective efficacy in semi-professional soccer. In addition, within two of these studies, the effect of pivotal hypothetical injuries on players' and coaches' perceptions of CE were also examined. In the first and second studies, hierarchical linear modeling (HLM) was utilized in order to examine simultaneous player and team level predictors of efficacy perceptions. Data were obtained from semi-professional male soccer players (N = 139, mean age = 23, SD = 4.43 yrs) from nine teams in Western Australia. Participants completed the Group Environment Questionnaire (GEQ), the revised Perceived Motivational Climate in Sport Questionnaire-2 (PMCSQ-2) as well as measures of self-talk, self-efficacy (SE), and CE created for this study. HLM analyses indicated CE was significantly and positively associated with SE and significantly and negatively associated with perceptions of a performance-oriented motivational climate. Significant positive associations of SE were positive self-talk and average number of minutes played each game. Negative correlates of SE were a performance-oriented motivational climate and number of years played. The results illustrate the important cross-level influences of player and team level variables on SE and CE perceptions. Overall, the findings provide support for the propositions of the influence of sources of efficacy information and broaden the existing work on efficacy and motivational climate in sport. ... Future research on team processes following injury that may moderate the injury efficacy relationship may include, the effect of team leaders in an attempt to motivate the team and the verbal and non-verbal strategies of coaches. The present studies contribute to the existing body of knowledge concerning efficacy theory. Specifically, within this series of studies, individual and team level predictors of SE and CE among elite sport participants were examined. A performance-oriented motivational climate was negatively associated with CE perceptions, while players with elevated levels of SE had teams with elevated levels of CE. SE was positively associated with positive self-talk, and negatively correlated with a performance-oriented motivational climate. Further, the effects of player injury on CE perceptions also represent a valuable contribution to efficacy theory. Prior to the current studies, no researchers have studied the influence of athlete absence due to injury on CE.