Former Chelsea coach Ray Wilkins feels his old club are paying for a poor transfer market.
Wilkins thinks the departures of two key players has left the Italian short.
Speaking on talkSPORT, he said: “They've only got one real centre-forward (Alvaro Morata), Michy Batshuayi is not up to it, and the release of Costa has cost them dearly.
“The sale of Nemanja Matic too. Bakayoko could have come and backed him up, but he doesn't look like he's the real deal at the moment.
“The way things have gone for them in the market haven't really helped them."