Thomas Tuchel was disgusted by Chelsea's first-half performance against Real Madrid at Stamford Bridge on Wednesday.
The Blues went down 3-1 in their Champions League quarter-final first leg.
Speaking after the game, Tuchel says his team will get 'hammered' by Southampton this weekend if they don't improve.
"It is a heavy loss," Tuchel said. "It was one of the worst first halves that I saw from us here at Stamford Bridge. Individually and as a team it was by far not enough. It was far from our standards and then you lose games.
"Passing, where we passed, how we passed when we passed, when we attacked, the ball possession game... first half was so from any standards that we set ourselves that we cannot complain when we lose.
"We had 16 shots in the second half. You can always come back and win it but when you kill the game by yourself after 45 minutes it is harder and harder.
"No, we don't have to go to Madrid we have to go Southampton and it is very important to process this. It is crucial that we go to Southampton. If we keep playing like this we will lose at Southampton and then we will get hammered at Bernabeu."
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