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BACKGROUND: The correct evaluation of external load parameters is a key factor in professional football. The instrumentations usually utilised to quantify the external load parameters during official matches are Video-Tracking Systems (VTS). VTS is a technology that records twodimensional position data (x and y) at high sampling rates (over 25 Hz). The aim of this study was to evaluate the intra-system reliability of Digital. Stadium® VTS. METHODS: 28 professional male football players taking part in the Italian Serie A (age 24±6 years, body mass 79.5±7.8 kg, stature 1.83±0.05 m) during the 2015/16 season were enrolled in this study (Team A and Team B). Video-analysis was done during an official match and data analysis was performed immediately after the game ended and then replicated a week later. RESULTS: This study reported a near perfect relationship between the initial analysis (analysis 1) and the …