By Tony Jimenez
LONDON, April 21 (Reuters) - Champions-elect Chelsea may have to go into Sunday's top of the table showdown against Arsenal at the Emirates without their three main strikers.
Spain striker Diego Costa has only just returned to training after missing two games with a recurring hamstring injury while a calf strain sidelined France forward Loic Remy for last Saturday's 1-0 win over Manchester United.
Didier Drogba featured against United but sustained an ankle injury that kept him out of Monday night's 12th Match Against Poverty, a game in St Etienne dedicated to the victims of the Ebola epidemic in Africa.