Costa has become one of the biggest names in Europe after a stunning season, prompting Chelsea to fork out £32m to sign him. Yet with any move, there are of course plenty of positives and negatives for such a move. How does Chelsea's move to sign Costa grade out?
After watching the likes of Demba Ba, Samuel Eto'o and Fernando Torres struggle to find the back of the net on a regular basis last season, Chelsea simply had to spend bit on a striker this summer. Fortunately, they've landed one of the deadliest strikers in Europe in Costa.
The Brazilian-turned-Spaniard hit 35 goals in 44 games as Atletico clinched the La Liga title for the first time in nearly 20 years, and the 25-year-old appears to fit the mould of a striker that would play under Jose Mourinho. Physical, aggressive and able to play up front on his own, Costa is a wind-up merchant who will no doubt become a villain of the Premier League upon his arrival.
Costa's stunning season kind of come out of nowhere. He had always had ability with Atletico and during a loan spell with Rayo Vallecano, but there are fears that he could be something of a one-season wonder - particularly after his disappointing showing at the World Cup with Spain.
Additionally, Costa scored just once in nine games against Real Madrid and Barcelona, prompting some people to believe that Costa could be a flat track bully. There will also no doubt be concerns over Costa's temperament and his injury history, having struggled massively towards the end of last season.
Chelsea may have failed in recent years with strikers costing big money - see Andriy Shevchenko and Fernando Torres, for example - but Costa has what it takes to be a success in England. He certainly has the athletic ability to cope with the more physical style of football in the Premier League, but he has to arrest some fears over whether his phenomenal season was nothing more than a flash in the pan. He seems to be the perfect 'Mourinho' striker, and whilst £32m is a large outlay for him, Costa should repay that price tag - whether it's this season or in the future, as there could be some growing pains upon arriving in England.