There was plenty being written last season about Chelsea's need for a clinical striker, what with the combination of Samuel Eto’o, Demba Ba and £50 million man Fernando Torres only contributing 19 goals between them all of last season.
Last season Mourinho admitted his team needed that “killer” goal scorer, yet refused to get a new face in during the January window. Why? Because he was waiting his time to secure his number one target, Diego Costa.
The Brazilian born front man has everything that is required to succeed in the Premier League. He will give many centre backs sleepless nights the same way Didier Drogba did back during Mourinho's first stint in charge. Costa has the physicality, as well as the acceleration on the turn, to cause havoc amongst back lines.
Last season the Spain international netted on 27 occasions in the league, which was one of the key reason as to why Atletico Madrid picked up their first La Liga title since 1996. He managed to reach that tally with the likes of Arda Turan and Koke supporting and assisting him.
With the greatest respect to these players and the rest of the Atletico team, Costa will certainly benefit more from the support the likes of Eden Hazard, Oscar and national teammate Cesc Fabregas can offer playing behind him.
Mourinho seems to have plenty of confidence that Costa will be a long term success at Stamford Bridge, highlighted by the permanent sale of Romelu Lukaku to Everton.
Costa’s goals will go a long way to help firing Chelsea to the Premier League title. This being said if he picks up an injury it’s hard to see where the goals will come from once again, with Drogba no longer being a 15 plus man and the constant failure of Torres.