Liverpool boss Jurgen Klopp is baffled how a football match can lead to people getting hurt.

Irish Liverpool fan Sean Cox is in a critical condition after being injured by Roma fans before Tuesday's Champions League semi-final first leg at Anfield.

"It is only football. I never understood people who never understood that," the German boss said.

"It should never have happened and it should not happen in the future. We have to do everything to make sure things like that will not happen anymore."

"The game on Tuesday showed the beauty of the game during it - then it showed the most ugly face," added Klopp.

"It is common sense. Treat people how you want to be treated yourself."