Diego Simeone opted not to shake Jurgen Klopp's hand after Liverpool's Champions League win over Atletico Madrid, with the Rojiblancos boss darting down the tunnel as soon as the final whistle sounded.
The Reds escaped their trip to Spain with a 3-2 victory, taking advantage of Antoine Greizmann's red card before Mohamed Salah converted from the spot in the second half to break the deadlock.
Atleti, meanwhile, were denied a penalty of their own moments later and, as the match ended, Simeone opted to head straight to the dressing room, leaving Klopp without a postgame handshake and the German yelling down the tunnel.
"We don't like that, but yes, the situation is clear," Klopp told BT Sport. "I want to shake his hand. His reaction for sure, like mine, was not so cool.
"The next time we see each other we will definitely shake hands. It's nothing. He was obviously angry, not with me but with the game. There is nothing else."