Chelsea have 'banned banter' between players at training, according to reports.
The season has started in disappointing fashion for the Blues, who lie 17th in the Premier League table following their 3-1 loss to Everton on Saturday.
The Telegraph claims that all jokes between players are now forbidden at the club's Cobham training ground in an attempt to find their form.
Chelsea start their Champions League campaign against Maccabi Tel Aviv on Wednesday.