Liverpool were beaten 1-0 by Swansea City on Monday night in the Premier League - and Jurgen Klopp was not in a very good mood.
Alfie Mawson scored the only goal of the game, capitalising on a poor Virgil van Dijk headed clearance.
Liverpool beat runaway league leaders Manchester City 4-3 in their last outing but, surprisingly, struggled to threaten Swansea's goal at the Liberty Stadium.
The Reds lie fourth in the Premier League table, just two points above Spurs.
There will have to be a major improvement if Liverpool are to beat West Brom in the FA Cup fourth round on Saturday afternoon.
Swansea fan makes Klopp mad
In the 60th minute, Mohamed Salah's free kick was tipped over the bar by Polish goalkeeper Lukasz Fabianski - and Liverpool's German manager was pushed over the edge in the dugout.
Speaking after the game, Klopp admitted that he shouted back at a supporter who had repeatedly been attempting to wind him up.
A steward stepped in to calm the situation.
“He was shouting at me all the time," revealed Klopp. "Sorry, I reacted one time, I remind myself I am a human being and not a professional manager who takes that all the time and they can say whatever they want.
“At one point, I said ‘please'. He felt quite good because nobody can do anything. He is in a good position. I'm sure I'm not the first manager. I think he's a season-ticket holder.
“It's my fault as well, I shouldn't have reacted. But I didn't say anything bad, only that I showed I wasn't too happy by what he was saying all the time.
“I am frustrated. I am more frustrated about the performance than the result. The result is always a result of the performance.
“We were just not good enough tonight, especially in the first half. We didn't play what we wanted to play."
It was Liverpool's first defeat in any competition since the 4-1 loss to Spurs in October.
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