Former West Ham striker Ian Wright supports the fans' protests - but says the pitch invasions on Saturday were "unacceptable".
Wright wrote for The Sun: "Let's get one thing clear — the West Ham fans who invaded the pitch on Saturday were bang out of order.
"There are no excuses, no strength of feeling can justify that.
"And the bottom line, the most crucial point, is that it will only damage the team's chances in the game itself.
"But while I will never condone running on, equally I will never dispute the supporters' right to protest. And those Hammers fans have had more reason than most.
"That's why the club's owners have got to take a long look at themselves, too. Take a long look at how it has come to this.
"And a long look at whether they have been true to their word."