We aimed to (1) compare external training loads obtained in futsal players during pre-season and in-season training weeks to explore how these loads are periodized by the coaching staff; and (2) compare the external training loads using the match day minus approach during the pre-season and in-season periods to determine how the within-microcycle training load varies between these periods. A total of 432 recordings were obtained of twelve national-level male amateur players using IPS devices. These data were collected over four consecutive microcycles from the beginning to the end of the pre-season, as well as during four additional consecutive microcycles at the start of the in-season. The external load variables evaluated were: total distance covered (TD; m), relative distance covered (Drel; m/min), high-speed running (HSR; m > 18.8 km/h), sprint distance (SPR; m > 25.2 km/h), number of intense accelerations (ACC; >2.5 m/s²) and decelerations (DEC; >−2.5 m/s²). Results indicated significant week-by-week variation (p < 0.05) in all external load variables during the pre-season. During the in-season, significant variations (p < 0.05) were observed only in Drel, HSR, and ACC. In both phases, all variables were higher (p < 0.05) two days before the match. In conclusion, it is important to consistently quantify the external loads of futsal players to ensure appropriate variation in loading and tapering within the microcycle, as well as during the pre-season and in-season periods.