Diego Costa furiously threw a bib to the ground during that game once it became apparent that he would not be coming on as a sub .
The Chelsea manager played down the ongoing controversy , insisting there are no doubts over the striker 's future .
Diego Costa furiously threw a bib to the ground during that game once it became apparent that he would not be coming on as a sub , but the Chelsea manager played down the ongoing controversy , insisting there are no doubts over the striker 's future .