Former Chelsea coach Ray Wilkins believes that current manager Jose Mourinho is still surviving in the club because of his past glories.
Wilkins, however, said that losing the upcoming match against Porto in the Champions League could bring Mourinho's career to an end.
According to Wilkins, Chelsea have lost their sense of invincibility under the current manager, the Mirror reported.
Echoing similar concerns, former England boss Kevin Keegan said that Chelsea have lost their form to get back into the top four again.
Chelsea have been struggling with the poor form in the Premier League and are currently just two points above the relegation zone in standings.
In the Champions League, Chelsea are second spot in Group G and will have to win their upcoming match against top-placed Porto in order to guarantee their place in knockouts.
The two sides will lock horns on December 10.
