Introduction: Football is a sport in which it is very important to establish quality training regimes in order to achieve the best possible preparation for the match. Therefore there has come to a closer monitoring of the players' load with the help of different methods. The goal of this research was to determine the workload of soccer players during the training process with the help of various tools for measuring workload. Materials and methods: The research was conducted at the end of the winter preparatory period in the period from January 31st, 2023 to February 11th, 2023. Seventeen players of the football club HNK Vukovar 1991 who compete in the SuperSport First Football League participated in the research. The internal load during training was monitored with the help of the Polar system, the external load of the players was monitored with the help of the Catapult One system, and the subjective load with the help of the Ultrax application. Results: Statistically significant differences were found in kilometers run (ᵪ²(7)=63.8 p=0.000), sprint distance (ᵪ²(7)=65.5 p=0.000), average and maximum heart rate (ᵪ²( 15)=120.8 p=0.000), and in the assessment of fatigue and muscle pain ((ᵪ²(15)=45.5 p=0.000) during all eight training sessions. Statistically significant differences were also found in all measurement methods between player positions during certain training sessions. Conclusion: Using different tools to measure the load during training is an essential item in modern football, in order to achieve the maximum performance of the players.