Bolton defender Zat Knight believes his team-mates are not taking their current poor form seriously enough.
After their opening day 4-0 win over QPR, Owen Coyle's side have lost their last five Premier League games, leaving the Trotters at the bottom of the table.
They have had to cope with long-term injuries to key players Stuart Holden and Lee Chung-Yong, while new signing Tyrone Mears is missing with a broken leg.
Their start to the season has arguably been tougher than any other club's after facing Manchester United, Liverpool and Arsenal already this term.
On Sunday, they entertain third-placed Chelsea, whose only defeat this season was at Old Trafford against Sir Alex Ferguson's side.
Knight has played in every minute of every game in the current campaign and says the whole squad needs to pull their weight.
He told The Mirror: "Something has to change - everyone has to be a bit more competitive and take things more seriously.
"Individually, we need to inherit more responsibility because when you look back at some of the goals we've conceded it's been a case of slack defending.
"We need to get back to being difficult to beat and go out all guns blazing."