Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Jose Mourinho is concerned about Diego Costa's fitness with the Chelsea striker a huge doubt for the Premier League opener against Swansea on Saturday. Costa was ruled out of the Community Shield against Arsenal after recurring hamstring problems and Mourinho admitted he was in the dark about his availability for the Stamford Bridge clash. The Chelsea boss says that while the Spain international is 'trying hard', watching the striker miss the end of last season's title-winning campaign as well as the prospect of sitting out the game this weekend is a worry. 'I have to be honest and say it’s a bit of a concern,' Mourinho said on talkSPORT on Wednesday morning.Diego Costa is a huge doubt for Chelsea's game with Swansea on SaturdaySpain international missed Community Shield match against ArsenalCosta has struggled with recurring hamstring problemsJose Mourinho: 'I have to be honest and say it’s a bit of a concern'Mourinho adds that Loic Remy or Radamel Falcao can fight for place 
 Question:Loic Remy and Radamel Falcao will fight for one position up front for the champions on Saturday should _ be officially ruled out.

Diego Costa