Antonio Conte insisted VAR wrongly overturned a correct penalty decision and claimed the system in this country is flawed following Tottenham's 1-1 draw at West Ham.
Spurs were awarded a spot-kick after 11 minutes when Harry Kane's header hit the outstretched arm of Hammers defender Aaron Cresswell.
But after a four-and-a-half-minute review at Stockley Park, referee Peter Bankes eventually went to the monitor which showed the ball had hit Cresswell's face before his arm, and overturned his own decision.
Spurs boss Conte said: 'It's difficult to explain.