Former player and assistant Ray Wilkins has questioned why Chelsea head coach Antonio Conte made a number of key changes during the summer.
Wilkins told Sky Sports News: "I don't think we are anywhere near as good as last year. We had the best forward (Costa) in the league last year. We had people at the club that you need at a football club, like John Terry.
"I don't know why we didn't offer John something around the club to keep that Chelsea business going on, I really don't.
"Bakayoko is no Matic, not yet anyway. Matic is just superb. I don't think we are anywhere near what we were last year."
Chelsea sit six points adrift of leaders Manchester City in the Premier League table.