Injury concerns over Diego Costa

   Diego Costa looked sharp in the early stages against Barcelona,
getting in some good positions and running at and taking on defenders from deep.

But it was a familiar story for the striker when, around the hour mark, he sat down on the pitch and signalled to be brought off with what appeared to be another injury problem. although Hazard was the main man to watch as chelsea won barca 4-2 on penalties

In a more ominous sign, Costa disappeared straight down the tunnel once he had been replaced by Loic Remy. 

Hamstring problems blighted an otherwise successful season for Costa last season, and the Chelsea medical staff will now be closely monitoring the striker's progress in the build-up to the opening day of the Premier League season, which is now less than two weeks away.