Chelsea, England’s champion-elect, might have to go into Sunday’s top-of-the-table showdown with Arsenal at the Emirates Stadium missing each of its three main strikers after DidierDrogba picked up an ankle injury in the 1-0 win against Manchester United on Saturday. Prior to Drogba, Diego Costa fell injured with a persistent hamstring problem a few weeks ago, whilesecond-choice striker Loic Remy picked up a calf strain in training last week.