Former Chelsea striker Didier Drogba believes the reigning Premier League champions are lacking leadership figures.
Jose Mourinho's men have been struggling to find their best form this campaign, sitting 15th in the league after 13 games.
Drogba has suggested the absence of strong characters in the dressing room - apart from John Terry - could be one of the reasons behind the club's recent difficulties.
"During my time at Chelsea we had a lot of leaders in the team, not only last year but during the previous seasons as well," Drogba was quoted as saying by The Sun.
"We had Frank Lampard, Petr Cech, John Terry, myself, Michael Ballack, Michael Essien, Andriy Shevchenko, Claude Makelele - big names, big players and big characters.
"We could take responsibility for a result and change the situation in bad moments such as when there was a change of manager or when we had bad results.
"Terry is still there but on your own it is very difficult, so other players have to come up with this mentality. But it is not something you are born with, you build it within you.