Chelsea manager Jose Mourinho has praised the goal-scoring prowess of £32m summer buy Diego Costa ' following his hat-trick against Swansea City on Saturday.

The Blues signed Costa from Atletico Madrid in the summer and the striker has lit the Premier League on fire by scoring seven goals in just four appearances.

His goals have already propelled Chelsea to the top of the Premier League table, as the Blues now remain the only side with a 100% winning record.