Gianfranco Zola insists that Chelsea are "not the perfect team" and the Blues don’t “create enough chances” despite the possession they have during matches.
The Chelsea assistant coach said they haven’t been good enough in the "last 20 metres" of the pitch and they need to improve on creating more opportunities to score.
Speaking ahead of Saturday's FA Cup third-round tie at home to Nottingham Forest, Zola said as Goal published: "I can tell you in the past Barcelona had problems in the last 20 metres, Bayern [Munich], [Manchester] City, everyone suffers when there is no space up there.
"This is the big issue we have, for the amount of time we have the ball we don't create enough chances. It is part of the process, we are not the perfect team.
"Southampton wasn't easy, when you have five games in your legs and it's the sixth it is not easy. We want to pay more attention to this [lack of chances]."