The Blues dropped to sixth place in the Premier League, following a 6-0 hammering at Manchester City on Sunday.
The defeat means Maurizio Sarri’s men are yet to win or score away from home this year and the slump in form has led to uncertainty about the Italian’s future at Stamford Bridge.
However, Collymore, writing in his UK Mirror column on Monday, insisted the fault lies somewhere else.
“Let’s get one thing straight: Maurizio Sarri is not the problem at Chelsea.
“The problem lies with Eden Hazard, David Luiz, Willian, Pedro and Co — all those players who are nowhere near as good as they want you to believe.
“Jose Mourinho knew that was the case during his second spell at Stamford Bridge and Antonio Conte soon worked it out as well.
“Sarri arguably realised quicker than either of those two given the speed with which he began to question the group’s mentality and tell the world how difficult they were to motivate,” Collymore stated.
