Chelsea boss Jose Mourinho admits Diego Costa is struggling for form after defeat at Newcastle United.
The recent absence was designed to rid him of his lingering fitness issues but has instead stalled the momentum which saw him smash 10 goals in his first 12 games.
Mourinho concedes his £32million marksman is not firing right now.
"He has to improve his condition," he said. "He was injured, he had many doubts and he had a long time without training and that obviously must have an effect on a player - the way he runs, the way he moves, his coordination. He has to recover but I don't think there is any problem. For me, the problem is not the goals. The goals will come as a consequence of his condition."
