article_snippet.sent: but Yun Suk-young (concussion) is still out alongside Eduardo Vargas, Leroy Fer and Alejandro Faurlin (all knee).
article_snippet.sent: Chelsea are without Diego Costa for Sunday's Barclays Premier League clash at QPR following Chelsea's hamstring injury.
article_snippet.sent: Diego Costa was forced off injured for Chelsea in their 2-1 win over Stoke last weekend .
highlights_snippet.sent: Yun Suk-young also absent with concussion for west London derby .
  
highlights_snippet.sent: Chelsea without Diego Costa due to hamstring injury .
  