Whoever will manage Chelsea, as it is now, will have a big challenge to bring about a change for the better. nothing is easy, even a coach who has had a long experience in his career.

I think Potter knows very well that the task is very difficult, it is not easy to lead Chelsea to change with the condition of the players who are experiencing a negative trend.  he has to adapt to the existing players, without being able to recruit new players.  like it or not, Potter and his team had to trust each other and had to adapt quickly.
and if Potter is able to bring chelsea through to the next round of the champions league, I think that is an achievement for Potter.