The protests came ahead of Leeds United's match against Liverpool, which ended in a 1-1 draw.
Liverpool are one of the six clubs who have declared themselves founder members of the breakaway competition, along with Manchester United, Manchester City, Tottenham Hotspur, Arsenal and Chelsea.
In pre and post-match interviews, Liverpool manager Jurgen Klopp insisted his negative opinion of a European Super League had not changed and stressed the importance of the “competitive factor of football”.
Klopp, speaking to Sky Sports ahead of his side’s game at Elland Road, stuck by his words from 2019 when he said he “hoped this Super League will never happen”.
“It didn’t change. My opinion didn’t change,” the German said.
Wortley-born Liverpool midfielder James Milner also criticised the plans.
“There is a lot of questions,” he told Sky Sports.
“I can only say my personal opinion, I don’t like it and hopefully it doesn’t happen. I can only imagine what has been said about it and I probably agree with most of it.
“I think for us we just try and concentrate on the game, there is obviously a lot going on, but for us we just have to try and be professional and concentrate on the game that is the only thing we can control.”