Ange Postecoglou lamented that VAR has diminished the authority of referees after he watched nine-man Tottenham lose 4-1 to Chelsea.A frenetic meeting between the two rivals saw five disallowed goals, two red cards, a penalty and two Spurs players forced off during the first half with injury, as Blues boss Mauricio Pochettino marked his return to north London by ending the Premier League's last unbeaten record.But the match was dominated by VAR’s involvement with the red cards two of nine decisions referred to the video referee.Even with nine men the hosts continued to take the game to Chelsea and were well in the contest before Nicolas Jackson twice sprung their high line in stoppage time to add his team’s third and fourth goals and complete an unlikely hat-trick.Postecoglou’s team had been comfortably on top in the first half before Cristian Romero’s red card in the 33rd minute, dismissed for a dangerous challenge on Enzo Fernandez and conceding the penalty from which Cole Palmer equalised Dejan Kulusevski’s deflected goal.Destiny Udogie followed 10 minutes into the second half, receiving a second yellow card for a foul on Raheem Sterling, but it took a further 20 minutes before Chelsea finally took the lead for the first time through Jackson.Spurs’ night was compounded by the loss of James Maddison and Micky van de Ven to injury, on top of what is likely to be a three-game ban for Romero.But it was VAR’s impact that dominated Postecoglou’s thoughts after the game after a total of 21 minutes were added on at the end of each half."It’s hard to analyse from a football perspective," he said."We’re left with a result which is disappointing, but (I’m) super-proud of the players’ efforts and will and desire to get something