Liverpool fans are planning to stage a mass walkout at Anfield this Saturday in protest at new £77 ticket prices.
The walkout - the first protest of its kind in the club's history - is being called for the 77th minute of Liverpool's next home match against Sunderland after ticket price increases for next season were unveiled earlier this week.
Match day tickets will cost as much as £77 while season tickets will reach £1,029.
Fans' group Spion Kop 1906 wrote in a statement: "LFC think it's acceptable to make more money than ever before from supporters. £2m more. That means price rises for many. £77 match tickets and £1,029 season tickets.
"Every week we get right behind the team. Now supporters need to get right behind each other. Let's make sure the owners know this is unacceptable.
"On 77 minutes, leave your seat and walk out. Tell your mates and family. Tell the people around you. Tell them why.
"Walk out on 77 minutes and show you care."
Liverpool's £114m main stand redevelopment is due to be completed from the start of the 2016/17 season and will increase Liverpool's capacity to 54,000.
Yet despite consultation on ticket prices with the elected Liverpool Supporters' Committee (LSC), new prices have angered fans.
Earlier this week LSC slammed the increases as "morally unjustifiable".
"At a time of ever-increasing commercial and media revenues, the club’s reliance on ‘general-admission’ returns is diminishing, and this is a lost opportunity for LFC to begin the reversal of the effects of inflation-busting prices that have forced out many loyal fans over recent years," the group said in a statement.
"We believe it is right and fair to lower ticket prices in order to sustain our support and subsequently the atmosphere inside Anfield. Unfortunately, the decisions of the ownership are based purely on economics with no compromise."