Liverpool face a tough battle to reach the Champions League knockout stage after suffering a 2-1 defeat against Paris St-Germain.
Their future in the competition has come down to an all-or-nothing decider at home to Napoli next month following a frustrating match in France.
Jurgen Klopp’s side have to beat the Serie A side by more than one goal to ensure progress to the knockout stage.
Angry Liverpool manager Jurgen Klopp criticised referee Szymon Marciniak after six Liverpool players were booked.
The Anfield coach told reporters after the match: ‘The number of interruptions in that game was just not cool.
‘Two times in a row we won the Fair Play award in England and tonight we look like butchers after the yellow cards we had.
‘It was clever of PSG, especially Neymar, but a lot of other players went down like it was really something serious and we were not that calm any more.
‘We were aggressive, and unfortunately negative aggression doesn’t help in football, we got rather frustrated and angry.
‘But we have to deal with it, that’s our job. If the referee lets that happen then we have to deal with it.’
Asked if the referee could have handled it better Klopp added: ‘There are a lot of things you can do. You can give yellow cards for everything.
‘If you go down, you act like you die and then the next moment you get up, yellow card. It’s possible. It’s unsportsmanlike behaviour.
‘In the end, it’s hectic and everyone is going down. I don’t expect help from a ref, I just expect him to calm all these things down.’