Bilic's side were lauded after finishing seventh last season but just months later they are languishing in the relegation zone following a miserable 3-0 home defeat on Sunday.
West Ham have the worst defensive record in the league after conceding 14 goals in their last four matches and Bilic is starting to lose patience with a team that looked desperately short of confidence against the Saints.
Threatening to axe his stars, Hammers boss Bilic fumed: "A player can make a mistake but it is all of us. These are the same players, at least 80 percent of the team was here last year.
"As a team at the moment we have to be clear, everything that was really good last year is bad this season.
"We are way below par. We can say the season has only just started, but it's happened for four games now. We have to change it, big time.
"The credit was there for a lot of them but now the credit is gone. We will pick the team purely on training."
Bilic's rant will do little for the confidence of players like Dimitri Payet, the France midfielder who is currently a shadow of the influential figure who shone so brightly last season.
And, with West Ham captain Mark Noble using a television interview to describe the defending as "laughable", Bilic was forced to concede his players' morale is at a low ebb.
"It's very hard to have confidence when you are 2-0 down. It's a chain. We had two heavy defeats before this and that started the situation when we are low on confidence," he said.
"They are training hard and want to do it but it's not happening."
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