"I have never seen anything like it in my life," Mascherano told Liverpoolfc.tv. "I spoke to some people in Argentina about it because it was amazing to see the stadium almost full for a memorial service. It would not happen at other clubs or in other countries.
"It's great the way the fans and the city came together. They still remember after 20 years the people who lost their lives.
"When I came here I didn't know what happened 20 years ago but living in the city and playing for Liverpool you hear all the stories. It was so sad."
Mascherano's first professional club, River Plate, endured their own stadium disaster in 1968 when 74 people died trying to escape a fire.