article_snippet: Chelsea striker Diego Costa keeps the ball up while sitting on the floor at the Cobham training ground .
article_snippet: Jose Mourinho watches on as defender Kurt Zouma (left) prepares to play a ball during training .
article_snippet: Thibaut Courtois (centre) tussles with defender Nathan Ake (centre right) in training .
article_snippet: Chelsea striker Didier Drogba dribbles with the ball during a training session at the club's Cobham base .
article_snippet: Chelsea striker Didier Drogba controls the ball as Chelsea prepare to try and get their Premier League campaign back on track .
article_snippet: Chelsea's Brazilian attacking midfielder Oscar dribbles with the ball at the Cobham training ground .
article_snippet: Chelsea striker Diego Costa makes a beeline for Ibrahimovic as the referee raises the red card .