Jose Mourinho tends to put players like John Obi Mikel and Kurt Zouma on when his side are trying to close out a win but with the opposition attacking them, it might be wise to put on a fresh winger to run at the defence.
Chelsea are one of the best counter attacking sides around and having the bench they do, putting on the likes of Willian or Schurrle in the last ten minutes could get them that second goal.