Dzeko struck twice to help Roma edge the game 3-2.
“We started well, but evidently felt comfortable with 2-0 and settled," the striker told Mediaset Premium.
“We gave the ball away too many times and did not play better than Pescara at all. We wanted to score more goals, this really isn't good enough and it makes everything more difficult.
“What mattered were the three points, so on that count we are satisfied, but we can't keep doing this. If Roma play like this, we're not going to win the derby next week."