That’s the verdict of former Blues player and coach Ray Wilkins in the wake of their stuttering start to the season.
Chelsea’s shock 2-1 defeat to struggling Crystal Palace last weekend leaves them on 13 points from their opening eight games.
And they must make up a nine-point deficit to early leaders Manchester City to have any chance of retaining the Premier League title.
Wilkins doesn’t think the men brought in to replace Costa and Matic, who were key men last term, are currently up to scratch though.
Wilkins told Sky Sports: "I think the squad is weaker.
"We have replaced Matic for Tiemoue Bakayoko. In the coming years, he will become an exceptional player because he has that stature and ability.
"He scored on Saturday but is not a great scorer from the middle of the pitch. Neither was Matic but he had the know-how of how to play that position. Bakayoko is still growing into that position.
"Morata up front has done very well but for me, he is no Diego Costa and unfortunately we have now lost Morata as well so we are having to rely on [Michy] Batshuayi.
"On Saturday he was a liability. His movement is almost null and void. When you are playing in a team like Chelsea your movement has to be first-class up front."
Chelsea will be looking to get back to winning ways when they face Roma in the Champions League tonight.
They return to Premier League action on Saturday when Marco Silva’s Watford travel to west London.
