article_snippet: Chelsea players surround referee Bjorn Kuipers and demand a red card is shown to Zlatan Ibrahimovic .
article_snippet: Zlatan Ibrahimovic (right) gets up as nine Chelsea players surround Ibrahimovic (right) and the referee after the incident .
article_snippet: Nemanja Matic (centre) appeals to the referee following Ibrahimovic's tackle on Oscar during the first half .
article_snippet: Chelsea players later look dejected as Chelsea players are knocked out of the Champions League round of 16 .
highlights_snippet: Chelsea were knocked out of the Champions League last-16 by PSG .
  
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