Chelsea boss Luiz Felipe Scolari was unimpressed despite their 4-0 Champions League victory over Bordeaux.
He said: "We made many mistakes in the second half. We did not control the game enough, we let them have too much of the ball. We did not play very well.
"We could be punished by other teams who get in front of goal faster and with quality. That is dangerous for us.
"When you are winning 2-0 at half-time you need to work the ball and control the game. You don't need to win 5-0."
The Brazilian coach was taking charge of his first Champions League match and spent much of it gesticulating wildly from the dugout.
While headers from Frank Lampard and Joe Cole had put Chelsea well in control in the first half, Scolari was disappointed his side did not show more discipline after the break.
Chelsea only added to their goals tally eight minutes from time when Florent Malouda drove home and Nicolas Anelka tapped in a fourth in injury time.
606: DEBATE
And Scolari hinted that his players were tactically naive and did not perform as he wanted, although he admitted it was vital to have got the victory.
"We tried to attack without the ball and with no good connections," he said. "But most important for us is the result.
"It is important to start with a win because in this competition you never know what will happen.
"You see that Cluj beat Roma. That is a warning for us for the next game."
Champions League debutants CFR 1907 Cluj came from behind to beat Roma to record a stunning 2-1 victory at the Stadio Olimpico.
The Romanians will host Chelsea on 1 October in the next round of matches.
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