Chelsea boss Thomas Tuchel has admitted the club must carefully manage Christian Pulisic's fitness issues after the winger suffered a calf problem in training.
Tuchel revealed on Friday that Pulisic is now in a 'zone of risk' after complaining of tightness - but also played down the problem as 'nothing big'.
The latest setback for the winger, 22, is likely to rule him out of the clash against Southampton this weekend.
Chelsea head into the fixture in fourth spot, having improved drastically under their new coach since his arrival last month.