A deplorable start to the 2015/16 campaign, in which the majority of their players have struggled fo find form, has resulted in Chelsea failing to replicate their emphatic and dominant displays of last season.
The Blues won the Premier League title with games to spare but have been a shadow of their former selves.
Currently 16th and with two wins in eight league games, question marks have been raised over not only the credentials of the squad, but also whether Jose Mourinho will be staying on as the manager at Stamford Bridge.
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The Portuguese, however, has received considerable backing from the club's owners in the midst of their poor form, after Chelsea themselves issued a formal statement which states Mourinho to be the perfect man to turn their fortunes.
His players have also come out in force to announce their backing for Mourinho, with out-of-form striker Diego Costa one of such names.
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Having been left out of Spain’s Euro qualifiers against Luxembourg and Ukraine, the 27-year-old is currently training at the club's Cobham Training Ground in a bid to regain fitness.
And amidst his struggle in front of goal, Costa has been brutally honest of himself.
According to the Daily Mail, he said: "Five to six weeks, I was not on top of my game, at least physically.
"I got injured at the end of season and then I went on holiday. Maybe I got out of my diet and when I came back I was not the way I was supposed to be.
"I was a little bit overweight, and that affected my game. You can be selfish and blame it on the manager but I’m not going to do that. I’m responsible and so are the other guys. We need to blame the players."
For a player forever at the centre of such controversy, it comes as great surprise, whilst refreshing, to hear the Spaniard criticise both himself and his team-mates for their poor form.
"We know we were not 100-per-cent when we got here. We came back from holiday very confident and thought we could go back into how it was last season.
"When we actually realised where we were, the team was already in a bad situation.
As a result of the striker's admission that the players are to blame, Costa turned his attentions to his under-fire manager, whom he believes remains the perfect manager.
"They can say whatever they want about Mourinho, but inside the dressing room, he is completely different from the idea people have of him. He gives us all the support we need. He is the best manager you can have."
Chelsea next face Aston Villa at home where Costa will return to action after his three match ban. The Blues then travel to Ukraine to face Dynamo Kyiv in the Champions League - an important game given their recent loss to FC Porto.
And whilst Costa's exclusion from the Spain squad might hurt the striker, the benefits that could come from a substantial period of time away from the football could be great.
The former Atletico Madrid man can spend time rehabilitating and working his way back to his physical conditions of past which, in turn, could mean for better performances and a return to goalscoring form.
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