London: Diego Costa ensured Chelsea remain top of the Premier League as the Spain striker's sparkling form continued in a dominant 3-0 win over Aston Villa on Saturday. Blues boss Joe Mourinho insists Costa, a £32 million ($51.9 million) pre-season signing from Atletico Madrid, is still not fully fit and is only capable of playing one game a week.


Diego Costa celebrates after scoring on Saturday 

But he looked in fine fettle at Stamford Bridge as he struck in the second half to take his season's tally to eight goals before creating Willian's late strike. Oscar's early opener had threatened to open the floodgates and Mourinho's men never looked troubled as they saw out this one-sided contest with ease.