Chelsea FC have agreed a £20 million fee with Ukrainian club Shakhtar Donetsk and will enter player negotiations soon accoring to reports.
Chelsea have been heavily linked with the attacking mid-fielder in the past few months.
The Brazilian has spent five years at the Shakhtar and has amassed 29 goals in 140 appeareances since joing from Gremio.
Chelsea are in the market for a back-up striker after the departure of club legend Didier Drogba and are said to be in a hurry to seal the signature of Costa.
With reports already fuming about a possible transfer, the recent comments of Costa have made it almost clear that the target men will move to the English champions this summer.
In a recent interview Costa stated “Eventually the time comes when you get tired of playing always in the same league,”.
“I’m 24 years old and it is worth trying to tell people that I want to go.”
“We have a wonderful coach in Mircea Lucescu, but I think it’s time for a change and I think Mourinho is the best in the world.
But the Brazilian is not cheap, and will cost a hefty £20 million ($30.8 million) if the Blues eventually get his signature, a huge sum for a back up striker, but with the versitality that Costa has in the mid-field, it might well be a bargain.
It is not just Costa who is being linked with a move to Stamford Bridge, but also Radamel Falcao, once, worlds top striker is also in the mix to sign up for the English giants.
After a failed loan move to Manchester United, Falcao is now keen on a move to the English champions Chelsea.
Falcao is reportdely ready to take a huge pay-cut to his £265,000-a-week wages and willing to fight for a first team place.
Monaco want a £5million loan fee for the columbian striker, talks are on between the two clubs about finalising the deal.
Falcao, who will captain Columbia at the Copa America in Chile wants his future to be sorted out before the tournament kicks off.