The Blues were touted with a move for the Shakhtar Donetsk star last window, but a move failed to materialise.
Costa also revealed how close he came to signing for the Premier League table toppers when he said: "Yes, I had a contact [with Chelsea] and the chance to work with a coach like Jose Mourinho always motivates a player.
"I am very grateful for the kindness he showed with me.
GETTY
Chelsea are eyeing up a move for Douglas Costa
"He is a very smart coach and who won [titles] wherever he has gone."
Spanish paper Mundo Deportivo claim Barcelona are sizing up a £20m move for Costa.
Luis Enrique is believed to be a fan of his and will check him out during Shakhtar's Champions League game against Bayern Munich tonight (7:45pm).
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