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Purpose: This study compared the physiological profiles and energy-system contributions of trained football players engaged in regular-passing and third-man-passing small-sided games (SSGs) that included 4 versus 4 and a goalkeeper. Methods: Ten male trained football players participated in this crossover study. All participants were randomly assigned to either regular-passing SSG or third-man-passing SSG (4 vs 4 with a goalkeeper, 35-m × 17-m pitch size, and 6-min match duration). During these SSGs, physiological parameters including peak and mean heart rate, oxygen uptake ( $\dot{\mathrm{V}}{\mathrm{O}}_2\text{peak}$ and $\dot{\mathrm{V}}{\mathrm{O}}_2\text{mean}$ ), metabolic equivalents in $\dot{\mathrm{V}}{\mathrm{O}}_2\text{peak}$ and $\dot{\mathrm{V}}{\mathrm{O}}_2\text{mean}$ , and blood lactate concentrations (peak La⁻ and delta La⁻ [Δ La⁻]), were measured. Energy contributions (oxidative [W _Oxi], glycolytic [W _Gly], and phosphagen [W _PCr] systems) and Global Positioning System (GPS) variables (total distance, total acceleration counts, mean speed, and maximum speed) were also analyzed. Results: No significant differences in physiological parameters and GPS variables were found between regular- and third-man-passing SSGs. W _Oxi in kilojoules and percentages was significantly higher during both SSGs than W _PCr and W _Gly (P < .0001, respectively). W _PCr and W _PCr + W _Gly values during third-man-passing SSGs were significantly higher than those during regular-passing SSGs (P < .05). Additionally, low to moderate positive correlations were observed between W _Oxi, W _Gly in kilojoules, $\dot{\mathrm{V}}{\mathrm{O}}_2\text{peak}$ , $\dot{\mathrm{V}}{\mathrm{O}}_2\text{mean}$ , peak La⁻, Δ La⁻, total acceleration counts, and mean speed (r = .39–.64). Conclusions: Third-man-passing SSGs may be useful for increasing anaerobic capacity. More third-man-passing SSG sessions in preparation for football games may support high metabolic power and repeated powerful anaerobic performances in trained football players.