Chelsea striker Diego Costa has deleted his Instagram profile leaving his club unaware of his whereabouts, according to the Sun.
The Premier League champions were believed to be keeping tabs on the disillusioned striker after he refused to return to London ahead of the start of the new season.
Now they are reportedly not clear as to where Costa is, despite suggestions that he could be set to return to the team having been included in their Premier League squad.
The Spanish forward attempted to instigate a move to Atletico Madrid before the close of the transfer window, but the deal failed to materialise and he is now likely to be forced to wait until January.