During the January transfer window, there were strong reports from outlets such as the Guardian, that Chelsea were bidding to sign Shakhtar Donetsk forward, Douglas Costa, with the player reportedly enthusing about a potential move by revealing: "It’s a dream to play for Chelsea, a unique opportunity,” whilst also stressing to Brazilian sports daily Globo Esporte he was a big admirer of Jose Mourinho and adding, "I am trying to negotiate [a departure]."
Ultimately his Ukrainian club refused to negotiate down from their valuation of around £30 million, despite the seemingly clear desire of the player to depart for Chelsea at the time. Meanwhile though, the indications are that Douglas Costa still wants to move elsewhere this coming summer, in order to further his career at the very highest level.
Chelsea are expected to make another approach, but this time they're likely to face much stiffer competition in the shape of Barcelona, who according to Catalan sports daily Mundo Deportivo, have Douglas Costa firmly marked as one of their key transfer targets.
Indeed, the interest from Barcelona in the 24-year-old isn't new, as they were reportedly planning a swoop last summer, but opted for Luis Suárez instead as their key addition to Luis Enrique's squad. However, the Asturian coach is a long-term admirer of Douglas Costa and tried to make a move during his tenure as manager of Roma. The interest from the Italian side was rejected by Shakhtar, in the same flat refusal to negotiate on price, that Chelsea encountered more recently.
Reports in France, from sources such as Le10Sport have also suggested PSG may enter the race this summer, but suggestions are that the player will favour either Chelsea or Barcelona as his primary options. What favours Jose Mourinho's side mostly, is that Barcelona are unable to register any new players until January 2016. The Catalan outfit don't believe this will pose them any significant problems though, as the current FIFA transfer ban doesn't restrict them from advancing moves for players, just registering them in their squad.