Paolo Di Canio has criticised his West Ham team-mates for being only 70% committed to the cause.
West Ham crashed to an embarrassing 7-1 defeat to Blackburn at Ewood Park, and manager Glenn Roeder is already under huge pressure.
However, Di Canio turned on his fellow players and said he predicted the Hammers' downfall months ago.
"I don't want to blame my team-mates, but there are some players who didn't show their quality and committed 70%, not 100," said Di Canio.
"This isn't possible in the Premiership, especially at a glorious team like West Ham.
"I'm very, very angry and what happened at Blackburn is what I predicted a few months ago.
"Now the manager has agreed with me and I'm happy for this, because when I said something everybody thought I was the crazy man.
"But the manager is intelligent and I think he'll now be tougher with the players and we will change the season."
Di Canio wants Roeder to add to the squad at Upton Park, and added: "I hope he will sign two or three Premiership players. It's not just my opinion but the opinion of everybody that our performance at Blackburn showed we don't have 16 Premiership players.
"You could go without a manager to Blackburn with the players we have, try to do our own system and we shouldn't lose 7-1 anyway.
"So to do it with a manager . . . this is not possible. They humiliated us and it wasn't Real Madrid or two Real Madrids against one West Ham.
"It's disgusting. Even if you play against 24 players you can't lose 7-1. This is the saddest moment in my football career because I've never seen West Ham supporters leave 20 minutes before the end of the game - and they were absolutely right.
"I have to accept the criticism as well. I have to do more. I never give up. I try to run but, of course, it was difficult because when you see every ball in our half of the pitch possibly leading to a goal you think it's not possible.
"There are players who must give much more and not think about a three-year contract covering them and thinking that maybe the manager will be sacked - this isn't fair."
Di Canio is, nonetheless, convinced West Ham will get it right and avoid the drop into the Nationwide League.
"We will never go down. We have too much class, but we have to work hard to show it."