It is hardly a surprise that the air turned blue in the Chelsea dressing room. This was a fourth successive Premier League match without a win and prompted fresh questions, as well as a few choice words, about the reasons for Chelsea's annual collapse at the first sign of a cold snap. "That's fucking rubbish" was overheard being shouted in a frank exchange of views during the post-match inquest. "It is normal," David Luiz said, when asked about the raised voices. "This is a big club, and in a big club you cannot lose games." Roberto Di Matteo needs no telling that is the case, which is why the Chelsea manager is taking evasive action at the earliest opportunity to prevent a damaging run of results from turning into something more sinister. The flamboyant football which served Chelsea so well earlier in the season, when they blazed a trail at the top of the table, looks like going into hibernation for a period, in favour of a more defensive approach, probably in the form of a 4-3-3 formation that turns into 4-5-1 without the ball. Chelsea have gone nine games without a clean sheet and conceded 18 goals in the process, which would be a dreadful record at any time of the season but leaves the European champions looking particularly vulnerable ahead of a daunting week. Di Matteo's side take on Juventus in Turin on Tuesday, where a defeat against the Serie A leaders would severely jeopardise their chances of