Atletico Madrid manager Diego Simeone was sent off after a fracas with Liverpool fans following Virgil van Dijk's last-gasp winner at Anfield. The Dutchman headed home in stoppage time to seal a 3-2 victory for the Reds.
Simeone was seen in a furious argument with supporters in the aftermath of the goal and was restrained by stewards. The referee then sent him off and he headed down the tunnel.
Atletico had staged an impressive turnaround to cancel out Liverpool's two-goal lead and restore parity. Marcos Llorente struck just before half-time and doubled his tally with nine minutes remaining.
But Van Dijk's header from a corner meant Liverpool made a winning start to their Champions League campaign.
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Earlier, a fortuitous Andy Robertson strike and a vintage Mohamed Salah goal put Liverpool in full control of the game after only six minutes.
But after fireworks on the pitch, there were more in the dugout after Van Dijk's winner. It is unclear what started the fracas, but Simeone was furious and shouted into the crowd while remonstrating with fans.
As he was pulled away from the incident, the referee gave him his marching orders. Simeone shook hands with the official before heading down the tunnel.
The Argentine has earned a reputation for his exuberant antics on the touchline over the course of his 14-year stint in the Spanish capital.
As a player, Simeone famously got David Beckham sent off at France 98 playing for Argentina against England in the last 16.
After the game, match-winner Van Dijk told TNT Sports: "We try, we kept pushing for the 3-1. We concede the equaliser, massively deflected. It was not great. We found a way again. We were dangerous in our set-pieces anyway, they were pretty aggressive I must say. I'm glad I got the winner.
"They're a team that never gives up, they have quality players that can punish you if you're not there in a split second, if you're a little bit too late and they punished us before the break and after the break we try to go for the 3-1.
"They get a bit of confidence from that as well. But we have to keep going and show the resilience we've been showing for many years and it was another great European night here again."
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